diff --git a/.scalafmt.conf b/.scalafmt.conf
index 84293359d..0662a5b12 100644
--- a/.scalafmt.conf
+++ b/.scalafmt.conf
@@ -13,3 +13,4 @@ project.excludePaths = [
   #   WixHelper.scala:105: error: Unable to format file due to bug in scalafmt
   "glob:**/src/main/scala/com/typesafe/sbt/packager/windows/WixHelper.scala"
 ]
+project.layout = StandardConvention
diff --git a/build.sbt b/build.sbt
index 705bc72df..34e822142 100644
--- a/build.sbt
+++ b/build.sbt
@@ -3,12 +3,15 @@ organization := "com.github.sbt"
 homepage := Some(url("https://github.com/sbt/sbt-native-packager"))
 
 Global / onChangedBuildSource := ReloadOnSourceChanges
-Global / scalaVersion := "2.12.20"
 
 // crossBuildingSettings
+lazy val scala212 = "2.12.20"
+lazy val scala3 = "3.3.4"
+Global / scalaVersion := scala3
+crossScalaVersions := Seq(scala3, scala212)
 (pluginCrossBuild / sbtVersion) := {
   scalaBinaryVersion.value match {
-    case "2.12" => "1.1.6"
+    case "2.12" => "1.5.8"
     case _      => "2.0.0-M2"
   }
 }
@@ -48,8 +51,7 @@ libraryDependencies ++= {
 // scala version depended libraries
 libraryDependencies ++= {
   scalaBinaryVersion.value match {
-    case "2.10" => Nil
-    case _ =>
+    case "2.12" =>
       Seq(
         // Do NOT upgrade these dependencies to 2.x or newer! sbt-native-packager is a sbt-plugin
         // and gets published with Scala 2.12, therefore we need to stay at the same major version
@@ -58,6 +60,8 @@ libraryDependencies ++= {
         "org.scala-lang.modules" %% "scala-parser-combinators" % "1.1.2", // Do not upgrade beyond 1.x
         "org.scala-lang.modules" %% "scala-xml" % "2.2.0"
       )
+    case _ =>
+      Nil
   }
 }
 
@@ -79,11 +83,11 @@ mimaPreviousArtifacts := {
   val m = "com.typesafe.sbt" %% moduleName.value % "1.3.15"
   val sbtBinV = (pluginCrossBuild / sbtBinaryVersion).value
   val scalaBinV = (update / scalaBinaryVersion).value
-  if (scalaBinV == "2.10") {
-    println(s"Skip MiMa check for SBT binary version ${sbtBinV} as scala ${scalaBinV} is not supported")
-    Set.empty
-  } else
-    Set(Defaults.sbtPluginExtra(m cross CrossVersion.disabled, sbtBinV, scalaBinV))
+  scalaBinV match {
+    case "2.12" =>
+      Set(Defaults.sbtPluginExtra(m cross CrossVersion.disabled, sbtBinV, scalaBinV))
+    case _ => Set.empty
+  }
 }
 
 // Release configuration
@@ -108,7 +112,8 @@ developers := List(
 addCommandAlias("scalafmtFormatAll", "; ^scalafmtAll ; scalafmtSbt")
 // ci commands
 addCommandAlias("validateFormatting", "; scalafmtCheckAll ; scalafmtSbtCheck")
-addCommandAlias("validate", "; clean ; update ; validateFormatting ; test ; mimaReportBinaryIssues")
+// Ignore mimaReportBinaryIssues
+addCommandAlias("validate", "; clean ; update ; validateFormatting ; test")
 
 // List all scripted test separately to schedule them in different travis-ci jobs.
 // Travis-CI has hard timeouts for jobs, so we run them in smaller jobs as the scripted
diff --git a/src/main/scala-sbt-1.0/com/typesafe/sbt/packager/Compat.scala b/src/main/scala-2.12/com/typesafe/sbt/packager/Compat.scala
similarity index 100%
rename from src/main/scala-sbt-1.0/com/typesafe/sbt/packager/Compat.scala
rename to src/main/scala-2.12/com/typesafe/sbt/packager/Compat.scala
diff --git a/src/main/scala-2.12/com/typesafe/sbt/packager/PluginCompat.scala b/src/main/scala-2.12/com/typesafe/sbt/packager/PluginCompat.scala
new file mode 100644
index 000000000..66e346ffe
--- /dev/null
+++ b/src/main/scala-2.12/com/typesafe/sbt/packager/PluginCompat.scala
@@ -0,0 +1,44 @@
+package com.typesafe.sbt.packager
+
+import java.nio.file.{Path => NioPath}
+import java.util.jar.Attributes
+import sbt.*
+import xsbti.FileConverter
+
+private[packager] object PluginCompat {
+  type FileRef = java.io.File
+  type ArtifactPath = java.io.File
+  type Out = java.io.File
+  type IncludeArtifact = Artifact => Boolean
+
+  val artifactStr = sbt.Keys.artifact.key
+  val moduleIDStr = sbt.Keys.moduleID.key
+  def parseModuleIDStrAttribute(m: ModuleID): ModuleID = m
+  def moduleIDToStr(m: ModuleID): ModuleID = m
+  def parseArtifactStrAttribute(a: Artifact): Artifact = a
+  def artifactToStr(art: Artifact): Artifact = art
+
+  def toNioPath(a: Attributed[File])(implicit conv: FileConverter): NioPath =
+    a.data.toPath()
+  def toNioPath(ref: File)(implicit conv: FileConverter): NioPath =
+    ref.toPath()
+  def toFile(a: Attributed[File])(implicit conv: FileConverter): File =
+    a.data
+  def toFile(ref: File)(implicit conv: FileConverter): File =
+    ref
+  def artifactPathToFile(ref: File)(implicit conv: FileConverter): File =
+    ref
+  def toArtifactPath(f: File)(implicit conv: FileConverter): ArtifactPath = f
+  def toNioPaths(cp: Seq[Attributed[File]])(implicit conv: FileConverter): Vector[NioPath] =
+    cp.map(_.data.toPath()).toVector
+  def toFiles(cp: Seq[Attributed[File]])(implicit conv: FileConverter): Vector[File] =
+    cp.map(_.data).toVector
+  def toFileRef(x: File)(implicit conv: FileConverter): FileRef =
+    x
+  def getName(ref: File): String =
+    ref.getName()
+  def getArtifactPathName(ref: File): String =
+    ref.getName()
+  def classpathAttr = Attributes.Name.CLASS_PATH
+  def mainclassAttr = Attributes.Name.MAIN_CLASS
+}
diff --git a/src/main/scala-3/com/typesafe/sbt/packager/Compat.scala b/src/main/scala-3/com/typesafe/sbt/packager/Compat.scala
new file mode 100644
index 000000000..9c148f0b4
--- /dev/null
+++ b/src/main/scala-3/com/typesafe/sbt/packager/Compat.scala
@@ -0,0 +1,3 @@
+package com.typesafe.sbt.packager
+
+object Compat {}
diff --git a/src/main/scala-3/com/typesafe/sbt/packager/PluginCompat.scala b/src/main/scala-3/com/typesafe/sbt/packager/PluginCompat.scala
new file mode 100644
index 000000000..00c4dde35
--- /dev/null
+++ b/src/main/scala-3/com/typesafe/sbt/packager/PluginCompat.scala
@@ -0,0 +1,56 @@
+package com.typesafe.sbt.packager
+
+import java.io.File
+import java.nio.file.{Path => NioPath}
+import java.util.jar.Attributes
+import sbt.*
+import xsbti.{FileConverter, HashedVirtualFileRef, VirtualFile, VirtualFileRef}
+import sbt.internal.RemoteCache
+
+private[packager] object PluginCompat:
+  type FileRef = HashedVirtualFileRef
+  type ArtifactPath = VirtualFileRef
+  type Out = VirtualFile
+  type IncludeArtifact = Any => Boolean
+
+  val artifactStr = Keys.artifactStr
+  val moduleIDStr = Keys.moduleIDStr
+  def parseModuleIDStrAttribute(str: String): ModuleID =
+    Classpaths.moduleIdJsonKeyFormat.read(str)
+  def moduleIDToStr(m: ModuleID): String =
+    Classpaths.moduleIdJsonKeyFormat.write(m)
+
+  def parseArtifactStrAttribute(str: String): Artifact =
+    import sbt.librarymanagement.LibraryManagementCodec.ArtifactFormat
+    import sjsonnew.support.scalajson.unsafe.*
+    Converter.fromJsonUnsafe[Artifact](Parser.parseUnsafe(str))
+  def artifactToStr(art: Artifact): String =
+    import sbt.librarymanagement.LibraryManagementCodec.ArtifactFormat
+    import sjsonnew.support.scalajson.unsafe.*
+    CompactPrinter(Converter.toJsonUnsafe(art))
+
+  def toNioPath(a: Attributed[HashedVirtualFileRef])(using conv: FileConverter): NioPath =
+    conv.toPath(a.data)
+  def toNioPath(ref: HashedVirtualFileRef)(using conv: FileConverter): NioPath =
+    conv.toPath(ref)
+  inline def toFile(a: Attributed[HashedVirtualFileRef])(using conv: FileConverter): File =
+    toNioPath(a).toFile()
+  inline def toFile(ref: HashedVirtualFileRef)(using conv: FileConverter): File =
+    toNioPath(ref).toFile()
+  def artifactPathToFile(ref: VirtualFileRef)(using conv: FileConverter): File =
+    conv.toPath(ref).toFile()
+  def toArtifactPath(f: File)(using conv: FileConverter): ArtifactPath =
+    conv.toVirtualFile(f.toPath())
+  def toNioPaths(cp: Seq[Attributed[HashedVirtualFileRef]])(using conv: FileConverter): Vector[NioPath] =
+    cp.map(toNioPath).toVector
+  inline def toFiles(cp: Seq[Attributed[HashedVirtualFileRef]])(using conv: FileConverter): Vector[File] =
+    toNioPaths(cp).map(_.toFile())
+  def toFileRef(x: File)(using conv: FileConverter): FileRef =
+    conv.toVirtualFile(x.toPath())
+  def getName(ref: FileRef): String =
+    ref.name()
+  def getArtifactPathName(ref: ArtifactPath): String =
+    ref.name()
+  def classpathAttr: String = Attributes.Name.CLASS_PATH.toString()
+  def mainclassAttr: String = Attributes.Name.MAIN_CLASS.toString()
+end PluginCompat
diff --git a/src/main/scala-sbt-0.13/com/typesafe/sbt/packager/Compat.scala b/src/main/scala-sbt-0.13/com/typesafe/sbt/packager/Compat.scala
deleted file mode 100644
index 2f1cab8de..000000000
--- a/src/main/scala-sbt-0.13/com/typesafe/sbt/packager/Compat.scala
+++ /dev/null
@@ -1,50 +0,0 @@
-package com.typesafe.sbt.packager
-
-import sbt.{Artifact, BufferedLogger, FullLogger, Logger}
-
-import scala.sys.process.ProcessLogger
-
-object Compat {
-
-  /**
-    * Used in:
-    *
-    *   - [[com.typesafe.sbt.packager.windows.WindowsPlugin]]
-    *   - [[com.typesafe.sbt.packager.rpm.RpmHelper]]
-    *   - [[com.typesafe.sbt.packager.docker.DockerPlugin]]
-    *   - [[com.typesafe.sbt.packager.debian.DebianNativePackaging]]
-    *   - [[com.typesafe.sbt.packager.rpm.RpmPlugin]]
-    *
-    * @param log
-    * @return
-    *   turns a Logger into a ProcessLogger
-    */
-  implicit def log2ProcessLogger(log: Logger): sys.process.ProcessLogger =
-    new BufferedLogger(new FullLogger(log)) with sys.process.ProcessLogger {
-      def err(s: => String): Unit = error(s)
-      def out(s: => String): Unit = info(s)
-    }
-
-  /**
-    * Used in
-    *
-    *   - [[com.typesafe.sbt.packager.docker.DockerPlugin]]
-    *
-    * @param logger
-    *   The sbt.ProcessLogger that should be wrapped
-    * @return
-    *   A scala ProcessLogger
-    */
-  implicit def sbtProcessLogger2ScalaProcessLogger(logger: sbt.ProcessLogger): sys.process.ProcessLogger =
-    ProcessLogger(msg => logger.info(msg), err => logger.error(err))
-
-  /**
-    * Use in the scripted `universal/multiproject-classifiers` test.
-    * @param artifact
-    *   polyfill new methods
-    */
-  implicit class CompatArtifact(artifact: Artifact) {
-    def withClassifier(classifier: Option[String]): Artifact =
-      artifact.copy(classifier = classifier)
-  }
-}
diff --git a/src/main/scala-sbt-0.13/com/typesafe/sbt/packager/MappingsHelper.scala b/src/main/scala-sbt-0.13/com/typesafe/sbt/packager/MappingsHelper.scala
deleted file mode 100644
index 636dc3126..000000000
--- a/src/main/scala-sbt-0.13/com/typesafe/sbt/packager/MappingsHelper.scala
+++ /dev/null
@@ -1,130 +0,0 @@
-package com.typesafe.sbt.packager
-
-import sbt._
-
-/** A set of helper methods to simplify the writing of mappings */
-object MappingsHelper {
-
-  /**
-    * return a Seq of mappings which effect is to add a whole directory in the generated package
-    *
-    * @example
-    *   {{{
-    * mappings in Universal ++= directory(baseDirectory.value / "extra")
-    *   }}}
-    *
-    * @param sourceDir
-    * @return
-    *   mappings
-    */
-  def directory(sourceDir: File): Seq[(File, String)] =
-    Option(sourceDir.getParentFile)
-      .map(parent => sourceDir.*** pair relativeTo(parent))
-      .getOrElse(sourceDir.*** pair basic)
-
-  /**
-    * It lightens the build file if one wants to give a string instead of file.
-    *
-    * @example
-    *   {{{
-    * mappings in Universal ++= directory("extra")
-    *   }}}
-    *
-    * @param sourceDir
-    * @return
-    *   mappings
-    */
-  def directory(sourceDir: String): Seq[(File, String)] =
-    directory(file(sourceDir))
-
-  /**
-    * return a Seq of mappings which effect is to add the content of directory in the generated package, excluding the
-    * directory itself.
-    *
-    * @example
-    *   {{{
-    * mappings in Universal ++= sourceDir(baseDirectory.value / "extra")
-    *   }}}
-    *
-    * @param sourceDir
-    * @return
-    *   mappings
-    */
-  def contentOf(sourceDir: File): Seq[(File, String)] =
-    (sourceDir.*** --- sourceDir) pair relativeTo(sourceDir)
-
-  /**
-    * It lightens the build file if one wants to give a string instead of file.
-    *
-    * @example
-    *   {{{
-    * mappings in Universal ++= sourceDir("extra")
-    *   }}}
-    *
-    * @param sourceDir
-    *   as string representation
-    * @return
-    *   mappings
-    */
-  def contentOf(sourceDir: String): Seq[(File, String)] =
-    contentOf(file(sourceDir))
-
-  /**
-    * Create mappings from your classpath. For example if you want to add additional dependencies, like test or model.
-    *
-    * @example
-    *   Add all test artifacts to a separated test folder
-    *   {{{
-    * mappings in Universal ++= fromClasspath((managedClasspath in Test).value, target = "test")
-    *   }}}
-    *
-    * @param entries
-    * @param target
-    * @return
-    *   a list of mappings
-    */
-  def fromClasspath(entries: Seq[Attributed[File]], target: String): Seq[(File, String)] =
-    fromClasspath(entries, target, _ => true)
-
-  /**
-    * Create mappings from your classpath. For example if you want to add additional dependencies, like test or model.
-    * You can also filter the artifacts that should be mapped to mappings.
-    *
-    * @example
-    *   Filter all osgi bundles
-    *   {{{
-    * mappings in Universal ++= fromClasspath(
-    *    (managedClasspath in Runtime).value,
-    *    "osgi",
-    *    artifact => artifact.`type` == "bundle"
-    * )
-    *   }}}
-    *
-    * @param entries
-    *   from where mappings should be created from
-    * @param target
-    *   folder, e.g. `model`. Must not end with a slash
-    * @param includeArtifact
-    *   function to determine if an artifact should result in a mapping
-    * @param includeOnNoArtifact
-    *   default is false. When there's no Artifact meta data remove it
-    */
-  def fromClasspath(
-    entries: Seq[Attributed[File]],
-    target: String,
-    includeArtifact: Artifact => Boolean,
-    includeOnNoArtifact: Boolean = false
-  ): Seq[(File, String)] =
-    entries.filter(attr => attr.get(sbt.Keys.artifact.key) map includeArtifact getOrElse includeOnNoArtifact).map {
-      attribute =>
-        val file = attribute.data
-        file -> s"$target/${file.getName}"
-    }
-
-  /**
-    * Get the mappings for the given files relative to the given directories.
-    */
-  def relative(files: Seq[File], dirs: Seq[File]): Seq[(File, String)] =
-    (files --- dirs) pair (relativeTo(dirs) | Path.flat)
-
-}
diff --git a/src/main/scala-sbt-0.13/com/typesafe/sbt/packager/SettingsHelper.scala b/src/main/scala-sbt-0.13/com/typesafe/sbt/packager/SettingsHelper.scala
deleted file mode 100644
index 5c3580234..000000000
--- a/src/main/scala-sbt-0.13/com/typesafe/sbt/packager/SettingsHelper.scala
+++ /dev/null
@@ -1,90 +0,0 @@
-package com.typesafe.sbt.packager
-
-import sbt.Keys._
-import sbt._
-
-object SettingsHelper {
-
-  def addPackage(
-    config: Configuration,
-    packageTask: TaskKey[File],
-    extension: String,
-    classifier: Option[String] = None
-  ): Seq[Setting[_]] =
-    inConfig(config)(
-      addArtifact(
-        name apply (Artifact(
-          _,
-          extension,
-          extension,
-          classifier = classifier,
-          configurations = Iterable.empty,
-          url = None,
-          extraAttributes = Map.empty
-        )),
-        packageTask
-      )
-    )
-
-  def makeDeploymentSettings(
-    config: Configuration,
-    packageTask: TaskKey[File],
-    extension: String,
-    classifier: Option[String] = None
-  ): Seq[Setting[_]] =
-    inConfig(config)(Classpaths.ivyPublishSettings ++ Classpaths.jvmPublishSettings) ++ inConfig(config)(
-      Seq(
-        artifacts := Seq.empty,
-        packagedArtifacts := Map.empty,
-        projectID := ModuleID(organization.value, name.value, version.value),
-        moduleSettings := InlineConfiguration(projectID.value, projectInfo.value, Seq.empty),
-        ivyModule := {
-          val ivy = ivySbt.value
-          new ivy.Module(moduleSettings.value)
-        },
-        deliverLocalConfiguration := Classpaths.deliverConfig(crossTarget.value, logging = ivyLoggingLevel.value),
-        deliverConfiguration := deliverLocalConfiguration.value,
-        publishConfiguration := new PublishConfiguration(
-          ivyFile = None,
-          resolverName = Classpaths.getPublishTo(publishTo.value).name,
-          artifacts = packagedArtifacts.value,
-          checksums = checksums.value,
-          logging = UpdateLogging.DownloadOnly,
-          overwrite = isSnapshot.value
-        ),
-        publishLocalConfiguration := new PublishConfiguration(
-          ivyFile = None,
-          resolverName = "local",
-          artifacts = packagedArtifacts.value,
-          checksums = checksums.value,
-          logging = UpdateLogging.DownloadOnly,
-          overwrite = isSnapshot.value
-        ),
-        publishM2Configuration := new PublishConfiguration(
-          ivyFile = None,
-          resolverName = Resolver.mavenLocal.name,
-          artifacts = packagedArtifacts.value,
-          checksums = checksums.value,
-          logging = UpdateLogging.DownloadOnly,
-          overwrite = isSnapshot.value
-        )
-      )
-    ) ++ addPackage(config, packageTask, extension, classifier) ++ addResolver(config)
-
-  /**
-    * SBT looks in the `otherResolvers` setting for resolvers defined in `publishTo`. If a user scopes a `publishTo`,
-    * e.g.
-    *
-    * {{{
-    * // publish the rpm to the target folder
-    * publishTo in Rpm := Some(Resolver.file("target-resolver", target.value / "rpm-repo" ))
-    * }}}
-    *
-    * then the resolver must also be present in the `otherResolvers`
-    *
-    * @param config
-    *   the ivy configuration to look for resolvers
-    */
-  private def addResolver(config: Configuration): Seq[Setting[_]] =
-    Seq(otherResolvers ++= (publishTo in config).value.toSeq)
-}
diff --git a/src/main/scala/com/typesafe/sbt/PackagerPlugin.scala b/src/main/scala/com/typesafe/sbt/PackagerPlugin.scala
index 4a4eec099..6c3ad77b9 100644
--- a/src/main/scala/com/typesafe/sbt/PackagerPlugin.scala
+++ b/src/main/scala/com/typesafe/sbt/PackagerPlugin.scala
@@ -1,10 +1,10 @@
 package com.typesafe.sbt
 
-import packager._
+import packager.*
 import debian.DebianPlugin.autoImport.genChanges
 import com.typesafe.sbt.packager.Keys.{packageXzTarball, packageZipTarball, validatePackage, validatePackageValidators}
 import com.typesafe.sbt.packager.validation.Validation
-import sbt._
+import sbt.{*, given}
 import sbt.Keys.{name, normalizedName, packageBin, streams}
 
 /**
@@ -73,16 +73,16 @@ object SbtNativePackager extends AutoPlugin {
 
     import SettingsHelper._
 
-    @deprecated("Use enablePlugins(xxxDeployPlugin)", "1.x")
-    def deploymentSettings =
-      makeDeploymentSettings(Debian, Debian / packageBin, "deb") ++
-        makeDeploymentSettings(Rpm, Rpm / packageBin, "rpm") ++
-        makeDeploymentSettings(Windows, Windows / packageBin, "msi") ++
-        makeDeploymentSettings(Universal, Universal / packageBin, "zip") ++
-        addPackage(Universal, Universal / packageZipTarball, "tgz") ++
-        makeDeploymentSettings(UniversalDocs, UniversalDocs / packageBin, "zip") ++
-        addPackage(UniversalDocs, UniversalDocs / packageXzTarball, "txz") ++
-        makeDeploymentSettings(Debian, Debian / genChanges, "changes")
+    // @deprecated("Use enablePlugins(xxxDeployPlugin)", "1.x")
+    // def deploymentSettings =
+    //   makeDeploymentSettings(Debian, Debian / packageBin, "deb") ++
+    //     makeDeploymentSettings(Rpm, Rpm / packageBin, "rpm") ++
+    //     makeDeploymentSettings(Windows, Windows / packageBin, "msi") ++
+    //     makeDeploymentSettings(Universal, Universal / packageBin, "zip") ++
+    //     addPackage(Universal, Universal / packageZipTarball, "tgz") ++
+    //     makeDeploymentSettings(UniversalDocs, UniversalDocs / packageBin, "zip") ++
+    //     addPackage(UniversalDocs, UniversalDocs / packageXzTarball, "txz") ++
+    //     makeDeploymentSettings(Debian, Debian / genChanges, "changes")
   }
 
   import autoImport._
diff --git a/src/main/scala-sbt-1.0/com/typesafe/sbt/packager/MappingsHelper.scala b/src/main/scala/com/typesafe/sbt/packager/MappingsHelper.scala
similarity index 69%
rename from src/main/scala-sbt-1.0/com/typesafe/sbt/packager/MappingsHelper.scala
rename to src/main/scala/com/typesafe/sbt/packager/MappingsHelper.scala
index 4e47424be..468ec724b 100644
--- a/src/main/scala-sbt-1.0/com/typesafe/sbt/packager/MappingsHelper.scala
+++ b/src/main/scala/com/typesafe/sbt/packager/MappingsHelper.scala
@@ -1,7 +1,8 @@
 package com.typesafe.sbt.packager
 
-import sbt._
-import sbt.io._
+import sbt.{*, given}
+import sbt.io.*
+import xsbti.FileConverter
 
 /** A set of helper methods to simplify the writing of mappings */
 object MappingsHelper extends Mapper {
@@ -37,6 +38,13 @@ object MappingsHelper extends Mapper {
   def contentOf(sourceDir: String): Seq[(File, String)] =
     contentOf(file(sourceDir))
 
+  def contentOf(sourceDir: File, conv0: FileConverter): Seq[(PluginCompat.FileRef, String)] = {
+    implicit val conv: FileConverter = conv0
+    contentOf(sourceDir).map { case (f, p) =>
+      PluginCompat.toFileRef(f) -> p
+    }
+  }
+
   /**
     * Create mappings from your classpath. For example if you want to add additional dependencies, like test or model.
     *
@@ -51,7 +59,10 @@ object MappingsHelper extends Mapper {
     * @return
     *   a list of mappings
     */
-  def fromClasspath(entries: Seq[Attributed[File]], target: String): Seq[(File, String)] =
+  def fromClasspath(
+    entries: Seq[Attributed[PluginCompat.FileRef]],
+    target: String
+  ): Seq[(PluginCompat.FileRef, String)] =
     fromClasspath(entries, target, _ => true)
 
   /**
@@ -78,20 +89,25 @@ object MappingsHelper extends Mapper {
     *   default is false. When there's no Artifact meta data remove it
     */
   def fromClasspath(
-    entries: Seq[Attributed[File]],
+    entries: Seq[Attributed[PluginCompat.FileRef]],
     target: String,
-    includeArtifact: Artifact => Boolean,
+    includeArtifact: PluginCompat.IncludeArtifact,
     includeOnNoArtifact: Boolean = false
-  ): Seq[(File, String)] =
-    entries.filter(attr => attr.get(sbt.Keys.artifact.key) map includeArtifact getOrElse includeOnNoArtifact).map {
+  ): Seq[(PluginCompat.FileRef, String)] =
+    entries.filter(attr => attr.get(PluginCompat.artifactStr).map(includeArtifact) getOrElse includeOnNoArtifact).map {
       attribute =>
         val file = attribute.data
-        file -> s"$target/${file.getName}"
+        val name = PluginCompat.getName(file)
+        file -> s"$target/${name}"
     }
 
   /**
     * Get the mappings for the given files relative to the given directories.
     */
-  def relative(files: Seq[File], dirs: Seq[File]): Seq[(File, String)] =
-    (files --- dirs) pair (relativeTo(dirs) | flat)
+  def relative(files: Seq[File], dirs: Seq[File], conv0: FileConverter): Seq[(PluginCompat.FileRef, String)] = {
+    implicit val conv: FileConverter = conv0
+    (files --- dirs) pair (relativeTo(dirs) | flat) map { case (f, p) =>
+      PluginCompat.toFileRef(f) -> p
+    }
+  }
 }
diff --git a/src/main/scala-sbt-1.0/com/typesafe/sbt/packager/SettingsHelper.scala b/src/main/scala/com/typesafe/sbt/packager/SettingsHelper.scala
similarity index 78%
rename from src/main/scala-sbt-1.0/com/typesafe/sbt/packager/SettingsHelper.scala
rename to src/main/scala/com/typesafe/sbt/packager/SettingsHelper.scala
index bdd2fd60f..b9124f03b 100644
--- a/src/main/scala-sbt-1.0/com/typesafe/sbt/packager/SettingsHelper.scala
+++ b/src/main/scala/com/typesafe/sbt/packager/SettingsHelper.scala
@@ -1,9 +1,10 @@
 package com.typesafe.sbt.packager
 
-import sbt._
-import sbt.Keys._
+import sbt.{*, given}
+import sbt.Keys.*
 import sbt.librarymanagement.{IvyFileConfiguration, PublishConfiguration}
-import com.typesafe.sbt.packager.Compat._
+import com.typesafe.sbt.packager.Compat.*
+import xsbti.FileConverter
 
 /**
   *   - TODO write tests for the SettingsHelper
@@ -14,7 +15,7 @@ object SettingsHelper {
 
   def addPackage(
     config: Configuration,
-    packageTask: TaskKey[File],
+    packageTask: TaskKey[PluginCompat.FileRef],
     extension: String,
     classifier: Option[String] = None
   ): Seq[Setting[_]] =
@@ -34,7 +35,7 @@ object SettingsHelper {
 
   def makeDeploymentSettings(
     config: Configuration,
-    packageTask: TaskKey[File],
+    packageTask: TaskKey[PluginCompat.FileRef],
     extension: String,
     classifier: Option[String] = None
   ): Seq[Setting[_]] =
@@ -58,19 +59,31 @@ object SettingsHelper {
         // -------------------------------
         publishConfiguration := PublishConfiguration()
           .withResolverName(Classpaths.getPublishTo(publishTo.value).name)
-          .withArtifacts(packagedArtifacts.value.toVector)
+          .withArtifacts(packagedArtifacts.value.toVector.map { case (a, f) =>
+            val conv0 = fileConverter.value
+            implicit val conv: FileConverter = conv0
+            (a, PluginCompat.toFile(f))
+          })
           .withChecksums(checksums.value.toVector)
           .withOverwrite(isSnapshot.value)
           .withLogging(UpdateLogging.DownloadOnly),
         publishLocalConfiguration := PublishConfiguration()
           .withResolverName("local")
-          .withArtifacts(packagedArtifacts.value.toVector)
+          .withArtifacts(packagedArtifacts.value.toVector.map { case (a, f) =>
+            val conv0 = fileConverter.value
+            implicit val conv: FileConverter = conv0
+            (a, PluginCompat.toFile(f))
+          })
           .withChecksums(checksums.value.toVector)
           .withOverwrite(isSnapshot.value)
           .withLogging(UpdateLogging.DownloadOnly),
         publishM2Configuration := PublishConfiguration()
           .withResolverName(Resolver.mavenLocal.name)
-          .withArtifacts(packagedArtifacts.value.toVector)
+          .withArtifacts(packagedArtifacts.value.toVector.map { case (a, f) =>
+            val conv0 = fileConverter.value
+            implicit val conv: FileConverter = conv0
+            (a, PluginCompat.toFile(f))
+          })
           .withChecksums(checksums.value.toVector)
           .withOverwrite(isSnapshot.value)
           .withLogging(UpdateLogging.DownloadOnly)
diff --git a/src/main/scala/com/typesafe/sbt/packager/Stager.scala b/src/main/scala/com/typesafe/sbt/packager/Stager.scala
index 525bda5a2..d9ca538b5 100644
--- a/src/main/scala/com/typesafe/sbt/packager/Stager.scala
+++ b/src/main/scala/com/typesafe/sbt/packager/Stager.scala
@@ -1,10 +1,12 @@
 package com.typesafe.sbt.packager
 
-import sbt._
+import sbt.{*, given}
 import sbt.Keys.TaskStreams
+import sbt.util.CacheStore
 import java.io.File
 
 import com.typesafe.sbt.packager.Compat._
+import xsbti.FileConverter
 
 object Stager {
 
@@ -20,12 +22,17 @@ object Stager {
     * @param mappings
     *   staging content
     */
-  def stageFiles(config: String)(cacheDirectory: File, stageDirectory: File, mappings: Seq[(File, String)]): File = {
+  def stageFiles(
+    config: String
+  )(cacheDirectory: File, stageDirectory: File, mappings: Seq[(PluginCompat.FileRef, String)])(implicit
+    conv: FileConverter
+  ): File = {
     val cache = cacheDirectory / ("packager-mappings-" + config)
-    val copies = mappings map { case (file, path) =>
-      file -> (stageDirectory / path)
+    val copies = mappings map { case (ref, path) =>
+      PluginCompat.toFile(ref) -> (stageDirectory / path)
     }
-    Sync(cache, FileInfo.hash, FileInfo.exists)(copies)
+    val store = CacheStore(cache)
+    Sync.sync(store, FileInfo.hash)(copies)
     // Now set scripts to executable using Java's lack of understanding of permissions.
     // TODO - Config file user-readable permissions....
     for {
@@ -41,7 +48,9 @@ object Stager {
     * @see
     *   stageFiles
     */
-  def stage(config: String)(streams: TaskStreams, stageDirectory: File, mappings: Seq[(File, String)]): File =
+  def stage(config: String)(streams: TaskStreams, stageDirectory: File, mappings: Seq[(PluginCompat.FileRef, String)])(
+    implicit conv: FileConverter
+  ): File =
     stageFiles(config)(streams.cacheDirectory, stageDirectory, mappings)
 
 }
diff --git a/src/main/scala/com/typesafe/sbt/packager/archetypes/JavaAppKeys.scala b/src/main/scala/com/typesafe/sbt/packager/archetypes/JavaAppKeys.scala
index 22cd57a18..4f6f46147 100644
--- a/src/main/scala/com/typesafe/sbt/packager/archetypes/JavaAppKeys.scala
+++ b/src/main/scala/com/typesafe/sbt/packager/archetypes/JavaAppKeys.scala
@@ -1,6 +1,7 @@
 package com.typesafe.sbt.packager.archetypes
 
-import sbt._
+import sbt.{*, given}
+import com.typesafe.sbt.packager.PluginCompat
 
 /**
   * Available settings/tasks for the [[com.typesafe.sbt.packager.archetypes.JavaAppPackaging]] and all depending
@@ -14,14 +15,10 @@ trait JavaAppKeys {
     "bashScriptEnvConfigLocation",
     "The location of a bash script that will be sourced before running the app."
   )
-  val scriptClasspathOrdering = TaskKey[Seq[(File, String)]](
-    "scriptClasspathOrdering",
-    "The order of the classpath used at runtime for the bat/bash scripts."
-  )
-  val projectDependencyArtifacts = TaskKey[Seq[Attributed[File]]](
-    "projectDependencyArtifacts",
-    "The set of exported artifacts from our dependent projects."
-  )
+  val scriptClasspathOrdering =
+    taskKey[Seq[(PluginCompat.FileRef, String)]]("The order of the classpath used at runtime for the bat/bash scripts.")
+  val projectDependencyArtifacts =
+    taskKey[Seq[Attributed[PluginCompat.FileRef]]]("The set of exported artifacts from our dependent projects.")
   val scriptClasspath = TaskKey[Seq[String]](
     "scriptClasspath",
     "A list of relative filenames (to the lib/ folder in the distribution) of what to include on the classpath."
diff --git a/src/main/scala/com/typesafe/sbt/packager/archetypes/JavaAppPackaging.scala b/src/main/scala/com/typesafe/sbt/packager/archetypes/JavaAppPackaging.scala
index 163976e53..dc921efa9 100644
--- a/src/main/scala/com/typesafe/sbt/packager/archetypes/JavaAppPackaging.scala
+++ b/src/main/scala/com/typesafe/sbt/packager/archetypes/JavaAppPackaging.scala
@@ -1,13 +1,15 @@
-package com.typesafe.sbt.packager.archetypes
+package com.typesafe.sbt.packager
+package archetypes
 
-import sbt._
-import sbt.Keys._
+import sbt.{*, given}
+import sbt.Keys.*
+import sbt.internal.BuildDependencies
 import com.typesafe.sbt.SbtNativePackager.{Debian, Universal}
-import com.typesafe.sbt.packager._
 import com.typesafe.sbt.packager.Keys.packageName
 import com.typesafe.sbt.packager.linux.{LinuxFileMetaData, LinuxPackageMapping}
 import com.typesafe.sbt.packager.linux.LinuxPlugin.autoImport.{defaultLinuxInstallLocation, linuxPackageMappings}
-import com.typesafe.sbt.packager.Compat._
+import com.typesafe.sbt.packager.Compat.*
+import xsbti.FileConverter
 
 /**
   * ==Java Application==
@@ -60,7 +62,8 @@ object JavaAppPackaging extends AutoPlugin {
       projectDependencyArtifacts := findProjectDependencyArtifacts.value,
       scriptClasspathOrdering ++= universalDepMappings(
         (Runtime / dependencyClasspath).value,
-        projectDependencyArtifacts.value
+        projectDependencyArtifacts.value,
+        fileConverter.value
       ),
       scriptClasspathOrdering := scriptClasspathOrdering.value.distinct,
       Universal / mappings ++= scriptClasspathOrdering.value,
@@ -77,7 +80,7 @@ object JavaAppPackaging extends AutoPlugin {
       bundledJvmLocation := (bundledJvmLocation ?? None).value
     )
 
-  private def makeRelativeClasspathNames(mappings: Seq[(File, String)]): Seq[String] =
+  private def makeRelativeClasspathNames(mappings: Seq[(PluginCompat.FileRef, String)]): Seq[String] =
     for {
       (_, name) <- mappings
     } yield
@@ -105,17 +108,14 @@ object JavaAppPackaging extends AutoPlugin {
 
   // Determines a nicer filename for an attributed jar file, using the
   // ivy metadata if available.
-  private def getJarFullFilename(dep: Attributed[File]): String = {
+  private def getJarFullFilename(dep: Attributed[PluginCompat.FileRef]): String = {
     val filename: Option[String] = for {
-      module <-
-        dep.metadata
-          // sbt 0.13.x key
-          .get(AttributeKey[ModuleID]("module-id"))
-          // sbt 1.x key
-          .orElse(dep.metadata.get(AttributeKey[ModuleID]("moduleID")))
-      artifact <- dep.metadata.get(AttributeKey[Artifact]("artifact"))
+      moduleStr <- dep.metadata.get(PluginCompat.moduleIDStr)
+      artifactStr <- dep.metadata.get(PluginCompat.artifactStr)
+      module = PluginCompat.parseModuleIDStrAttribute(moduleStr)
+      artifact = PluginCompat.parseArtifactStrAttribute(artifactStr)
     } yield makeJarName(module.organization, module.name, module.revision, artifact.name, artifact.classifier)
-    filename.getOrElse(dep.data.getName)
+    filename.getOrElse(PluginCompat.getName(dep.data))
   }
 
   // Here we grab the dependencies...
@@ -123,23 +123,27 @@ object JavaAppPackaging extends AutoPlugin {
     build.classpathTransitive.getOrElse(thisProject, Nil)
 
   // TODO - Should we pull in more than just JARs?  How do native packages come in?
-  private def isRuntimeArtifact(dep: Attributed[File]): Boolean =
-    dep.get(sbt.Keys.artifact.key).map(_.`type` == "jar").getOrElse {
-      val name = dep.data.getName
-      !(name.endsWith(".jar") || name.endsWith("-sources.jar") || name.endsWith("-javadoc.jar"))
-    }
+  private def isRuntimeArtifact(dep: Attributed[PluginCompat.FileRef]): Boolean =
+    dep
+      .get(PluginCompat.artifactStr)
+      .map(PluginCompat.parseArtifactStrAttribute)
+      .map(_.`type` == "jar")
+      .getOrElse {
+        val name = PluginCompat.getName(dep.data)
+        !(name.endsWith(".jar") || name.endsWith("-sources.jar") || name.endsWith("-javadoc.jar"))
+      }
 
-  private def findProjectDependencyArtifacts: Def.Initialize[Task[Seq[Attributed[File]]]] =
+  private def findProjectDependencyArtifacts: Def.Initialize[Task[Seq[Attributed[PluginCompat.FileRef]]]] =
     Def
-      .task {
+      .setting {
         val stateTask = state.taskValue
         val refs = thisProjectRef.value +: dependencyProjectRefs(buildDependencies.value, thisProjectRef.value)
         // Dynamic lookup of dependencies...
         val artTasks = refs map { ref =>
           extractArtifacts(stateTask, ref)
         }
-        val allArtifactsTask: Task[Seq[Attributed[File]]] =
-          artTasks.fold[Task[Seq[Attributed[File]]]](task(Nil)) { (previous, next) =>
+        val allArtifactsTask: Task[Seq[Attributed[PluginCompat.FileRef]]] =
+          artTasks.fold[Task[Seq[Attributed[PluginCompat.FileRef]]]](task(Nil)) { (previous, next) =>
             for {
               p <- previous
               n <- next
@@ -147,9 +151,8 @@ object JavaAppPackaging extends AutoPlugin {
           }
         allArtifactsTask
       }
-      .flatMap(identity)
 
-  private def extractArtifacts(stateTask: Task[State], ref: ProjectRef): Task[Seq[Attributed[File]]] =
+  private def extractArtifacts(stateTask: Task[State], ref: ProjectRef): Task[Seq[Attributed[PluginCompat.FileRef]]] =
     stateTask.flatMap { state =>
       val extracted = Project.extract(state)
       // TODO - Is this correct?
@@ -159,31 +162,43 @@ object JavaAppPackaging extends AutoPlugin {
         arts <- artifactTask
       } yield for {
         (art, file) <- arts.toSeq // TODO -Filter!
-      } yield Attributed.blank(file).put(moduleID.key, module).put(artifact.key, art)
+      } yield Attributed
+        .blank(file)
+        .put(PluginCompat.moduleIDStr, PluginCompat.moduleIDToStr(module))
+        .put(PluginCompat.artifactStr, PluginCompat.artifactToStr(art))
     }
 
-  private def findRealDep(dep: Attributed[File], projectArts: Seq[Attributed[File]]): Option[Attributed[File]] =
-    if (dep.data.isFile) Some(dep)
+  private def findRealDep(
+    dep: Attributed[PluginCompat.FileRef],
+    projectArts: Seq[Attributed[PluginCompat.FileRef]],
+    conv0: FileConverter
+  ): Option[Attributed[PluginCompat.FileRef]] = {
+    implicit val conv: FileConverter = conv0
+    if (PluginCompat.toFile(dep.data).isFile) Some(dep)
     else
       projectArts.find { art =>
         // TODO - Why is the module not showing up for project deps?
         // (art.get(sbt.Keys.moduleID.key) ==  dep.get(sbt.Keys.moduleID.key)) &&
-        (art.get(sbt.Keys.artifact.key), dep.get(sbt.Keys.artifact.key)) match {
-          case (Some(l), Some(r)) =>
+        (art.get(PluginCompat.artifactStr), dep.get(PluginCompat.artifactStr)) match {
+          case (Some(l0), Some(r0)) =>
+            val l = PluginCompat.parseArtifactStrAttribute(l0)
+            val r = PluginCompat.parseArtifactStrAttribute(r0)
             // TODO - extra attributes and stuff for comparison?
             // seems to break stuff if we do...
             l.name == r.name && l.classifier == r.classifier
           case _ => false
         }
       }
+  }
 
   // Converts a managed classpath into a set of lib mappings.
   private def universalDepMappings(
-    deps: Seq[Attributed[File]],
-    projectArts: Seq[Attributed[File]]
-  ): Seq[(File, String)] =
+    deps: Seq[Attributed[PluginCompat.FileRef]],
+    projectArts: Seq[Attributed[PluginCompat.FileRef]],
+    conv0: FileConverter
+  ): Seq[(PluginCompat.FileRef, String)] =
     for {
       dep <- deps
-      realDep <- findRealDep(dep, projectArts)
+      realDep <- findRealDep(dep, projectArts, conv0)
     } yield realDep.data -> ("lib/" + getJarFullFilename(realDep))
 }
diff --git a/src/main/scala/com/typesafe/sbt/packager/archetypes/JavaServerApplication.scala b/src/main/scala/com/typesafe/sbt/packager/archetypes/JavaServerApplication.scala
index f47c805d8..4327cf277 100644
--- a/src/main/scala/com/typesafe/sbt/packager/archetypes/JavaServerApplication.scala
+++ b/src/main/scala/com/typesafe/sbt/packager/archetypes/JavaServerApplication.scala
@@ -1,15 +1,17 @@
-package com.typesafe.sbt.packager.archetypes
+package com.typesafe.sbt.packager
+package archetypes
 
-import sbt._
-import sbt.Keys.{javaOptions, mainClass, run, sourceDirectory, streams, target}
+import sbt.{*, given}
+import sbt.Keys.{fileConverter, javaOptions, mainClass, run, sourceDirectory, streams, target}
 import com.typesafe.sbt.SbtNativePackager.{Debian, Linux, Rpm, Universal}
-import com.typesafe.sbt.packager.Keys._
+import com.typesafe.sbt.packager.Keys.*
 import com.typesafe.sbt.packager.linux.{LinuxFileMetaData, LinuxPackageMapping, LinuxPlugin, LinuxSymlink}
 import com.typesafe.sbt.packager.linux.LinuxPlugin.autoImport.packageTemplateMapping
 import com.typesafe.sbt.packager.debian.DebianPlugin
 import com.typesafe.sbt.packager.rpm.RpmPlugin
 import com.typesafe.sbt.packager.rpm.RpmPlugin.autoImport.RpmConstants
 import com.typesafe.sbt.packager.archetypes.systemloader.ServerLoader
+import xsbti.FileConverter
 
 /**
   * ==Java Server App Packaging==
@@ -256,7 +258,7 @@ object JavaServerAppPackaging extends AutoPlugin {
     }
 
     // used to override template
-    val rpmScripts = Option(scriptDirectory.listFiles) getOrElse Array.empty
+    val rpmScripts = Option(scriptDirectory.listFiles).getOrElse(Array.empty[File])
 
     // remove all non files and already processed templates
     rpmScripts.filter(s => s.isFile && !predefined.contains(s.getName)).foldLeft(predefinedScripts) {
diff --git a/src/main/scala/com/typesafe/sbt/packager/archetypes/TemplateWriter.scala b/src/main/scala/com/typesafe/sbt/packager/archetypes/TemplateWriter.scala
index 6a05541af..c447cdc62 100644
--- a/src/main/scala/com/typesafe/sbt/packager/archetypes/TemplateWriter.scala
+++ b/src/main/scala/com/typesafe/sbt/packager/archetypes/TemplateWriter.scala
@@ -49,7 +49,7 @@ object TemplateWriter {
       sb append replace(line, replacements, keySurround)
       sb append eol
     }
-    sb toString
+    sb.toString()
   }
 
   private[this] def replaceValues(
diff --git a/src/main/scala/com/typesafe/sbt/packager/archetypes/jlink/JlinkPlugin.scala b/src/main/scala/com/typesafe/sbt/packager/archetypes/jlink/JlinkPlugin.scala
index 5efedd9ae..7e58588be 100644
--- a/src/main/scala/com/typesafe/sbt/packager/archetypes/jlink/JlinkPlugin.scala
+++ b/src/main/scala/com/typesafe/sbt/packager/archetypes/jlink/JlinkPlugin.scala
@@ -3,15 +3,17 @@ package jlink
 
 import scala.collection.immutable
 import scala.sys.process.{BasicIO, Process, ProcessBuilder}
-import sbt._
-import sbt.Keys._
+import sbt.{*, given}
+import sbt.Keys.*
 import com.typesafe.sbt.SbtNativePackager.{Debian, Universal}
 import com.typesafe.sbt.packager.Keys.{bundledJvmLocation, packageName}
 import com.typesafe.sbt.packager.Compat._
+import com.typesafe.sbt.packager.PluginCompat
 import com.typesafe.sbt.packager.archetypes.jlink._
 import com.typesafe.sbt.packager.archetypes.scripts.BashStartScriptKeys
 import com.typesafe.sbt.packager.universal.UniversalPlugin
 import java.io.File
+import xsbti.FileConverter
 
 /**
   * ==Jlink Application==
@@ -51,10 +53,13 @@ object JlinkPlugin extends AutoPlugin {
     jlinkBuildImage / fullClasspath := (Compile / fullClasspath).value,
     jlinkModules := (jlinkModules ?? Nil).value,
     jlinkModules ++= {
+      val conv0 = fileConverter.value
+      implicit val conv: FileConverter = conv0
       val log = streams.value.log
       val javaHome0 = (jlinkBuildImage / javaHome).value.getOrElse(defaultJavaHome)
       val run = runJavaTool(javaHome0, log) _
-      val paths = (jlinkBuildImage / fullClasspath).value.map(_.data.getPath)
+      val paths =
+        (jlinkBuildImage / fullClasspath).value.map(PluginCompat.toNioPath).map(_.toString())
       val modulePath = (jlinkModules / jlinkModulePath).value
       val shouldIgnore = jlinkIgnoreMissingDependency.value
 
@@ -164,12 +169,15 @@ object JlinkPlugin extends AutoPlugin {
       outDir
     },
     jlinkBuildImage / mappings := {
+      val conv0 = fileConverter.value
+      implicit val conv: FileConverter = conv0
       val prefix = jlinkBundledJvmLocation.value
       // make sure the prefix has a terminating slash
       val prefix0 = if (prefix.isEmpty) prefix else prefix + "/"
 
       findFiles(jlinkBuildImage.value).map { case (file, string) =>
-        (file, prefix0 + string)
+        val ref = PluginCompat.toFileRef(file)
+        (ref, prefix0 + string)
       }
     },
     Universal / mappings ++= (jlinkBuildImage / mappings).value
@@ -256,7 +264,7 @@ object JlinkPlugin extends AutoPlugin {
     source: PackageDependency.Source
   )
 
-  private[jlink] final object PackageDependency {
+  private[jlink] object PackageDependency {
 
     implicit object PackageDependencyOrdering extends Ordering[PackageDependency] {
       override def compare(x: PackageDependency, y: PackageDependency): Int = {
diff --git a/src/main/scala/com/typesafe/sbt/packager/archetypes/scripts/ApplicationIniGenerator.scala b/src/main/scala/com/typesafe/sbt/packager/archetypes/scripts/ApplicationIniGenerator.scala
index 4c00aacab..8cf34a5f2 100644
--- a/src/main/scala/com/typesafe/sbt/packager/archetypes/scripts/ApplicationIniGenerator.scala
+++ b/src/main/scala/com/typesafe/sbt/packager/archetypes/scripts/ApplicationIniGenerator.scala
@@ -1,8 +1,10 @@
 package com.typesafe.sbt.packager.archetypes.scripts
 
+import com.typesafe.sbt.packager.PluginCompat
 import java.io.File
 
-import sbt._
+import sbt.{*, given}
+import xsbti.FileConverter
 
 trait ApplicationIniGenerator {
 
@@ -11,12 +13,12 @@ trait ApplicationIniGenerator {
     *   the existing mappings plus a generated application.ini if custom javaOptions are specified
     */
   def generateApplicationIni(
-    universalMappings: Seq[(File, String)],
+    universalMappings: Seq[(PluginCompat.FileRef, String)],
     javaOptions: Seq[String],
     bashScriptConfigLocation: Option[String],
     tmpDir: File,
     log: Logger
-  ): Seq[(File, String)] =
+  )(implicit conv: FileConverter): Seq[(PluginCompat.FileRef, String)] =
     bashScriptConfigLocation
       .collect {
         case location if javaOptions.nonEmpty =>
@@ -42,7 +44,8 @@ trait ApplicationIniGenerator {
             case _ =>
               true
           }
-          (configFile -> pathMapping) +: filteredMappings
+          val configFileRef = PluginCompat.toFileRef(configFile)
+          (configFileRef -> pathMapping) +: filteredMappings
 
       }
       .getOrElse(universalMappings)
diff --git a/src/main/scala/com/typesafe/sbt/packager/archetypes/scripts/BashStartScriptKeys.scala b/src/main/scala/com/typesafe/sbt/packager/archetypes/scripts/BashStartScriptKeys.scala
index 71eca3ca7..6883c96a7 100644
--- a/src/main/scala/com/typesafe/sbt/packager/archetypes/scripts/BashStartScriptKeys.scala
+++ b/src/main/scala/com/typesafe/sbt/packager/archetypes/scripts/BashStartScriptKeys.scala
@@ -1,6 +1,7 @@
 package com.typesafe.sbt.packager.archetypes.scripts
 
-import sbt._
+import sbt.{*, given}
+import com.typesafe.sbt.packager.PluginCompat
 
 /**
   * Keys related to the [[BashStartScriptPlugin]]
@@ -9,7 +10,7 @@ import sbt._
   *   [[BashStartScriptPlugin]]
   */
 trait BashStartScriptKeys {
-  val makeBashScripts = TaskKey[Seq[(File, String)]]("makeBashScripts", "Creates start scripts for this project.")
+  val makeBashScripts = taskKey[Seq[(PluginCompat.FileRef, String)]]("Creates start scripts for this project.")
   val bashScriptTemplateLocation =
     TaskKey[File]("bashScriptTemplateLocation", "The location of the bash script template.")
 
diff --git a/src/main/scala/com/typesafe/sbt/packager/archetypes/scripts/BashStartScriptPlugin.scala b/src/main/scala/com/typesafe/sbt/packager/archetypes/scripts/BashStartScriptPlugin.scala
index 1e74a29b3..1b4956775 100644
--- a/src/main/scala/com/typesafe/sbt/packager/archetypes/scripts/BashStartScriptPlugin.scala
+++ b/src/main/scala/com/typesafe/sbt/packager/archetypes/scripts/BashStartScriptPlugin.scala
@@ -5,8 +5,9 @@ import java.io.File
 import com.typesafe.sbt.SbtNativePackager.Universal
 import com.typesafe.sbt.packager.Keys._
 import com.typesafe.sbt.packager.archetypes.{JavaAppPackaging, TemplateWriter}
-import sbt.Keys._
-import sbt._
+import sbt.Keys.*
+import sbt.{*, given}
+import xsbti.FileConverter
 
 /**
   * ==Bash StartScript Plugin==
@@ -69,13 +70,17 @@ object BashStartScriptPlugin extends AutoPlugin with ApplicationIniGenerator wit
       bashScriptConfigLocation := (bashScriptConfigLocation ?? Some(appIniLocation)).value,
       bashScriptEnvConfigLocation := (bashScriptEnvConfigLocation ?? None).value,
       // Generating the application configuration
-      Universal / mappings := generateApplicationIni(
-        (Universal / mappings).value,
-        (Universal / javaOptions).value,
-        bashScriptConfigLocation.value,
-        (Universal / target).value,
-        streams.value.log
-      ),
+      Universal / mappings := {
+        val conv0 = fileConverter.value
+        implicit val conv: FileConverter = conv0
+        generateApplicationIni(
+          (Universal / mappings).value,
+          (Universal / javaOptions).value,
+          bashScriptConfigLocation.value,
+          (Universal / target).value,
+          streams.value.log
+        )
+      },
       makeBashScripts := generateStartScripts(
         BashScriptConfig(
           executableScriptName = executableScriptName.value,
@@ -87,6 +92,7 @@ object BashStartScriptPlugin extends AutoPlugin with ApplicationIniGenerator wit
         (Compile / bashScriptDefines / mainClass).value,
         (Compile / discoveredMainClasses).value,
         (Universal / target).value / "scripts",
+        fileConverter.value,
         streams.value.log
       ),
       Universal / mappings ++= makeBashScripts.value
diff --git a/src/main/scala/com/typesafe/sbt/packager/archetypes/scripts/BatStartScriptKeys.scala b/src/main/scala/com/typesafe/sbt/packager/archetypes/scripts/BatStartScriptKeys.scala
index ab9042eba..550c2123d 100644
--- a/src/main/scala/com/typesafe/sbt/packager/archetypes/scripts/BatStartScriptKeys.scala
+++ b/src/main/scala/com/typesafe/sbt/packager/archetypes/scripts/BatStartScriptKeys.scala
@@ -1,4 +1,5 @@
-package com.typesafe.sbt.packager.archetypes.scripts
+package com.typesafe.sbt.packager
+package archetypes.scripts
 
 import sbt._
 
@@ -9,7 +10,8 @@ import sbt._
   *   [[BatStartScriptPlugin]]
   */
 trait BatStartScriptKeys {
-  val makeBatScripts = TaskKey[Seq[(File, String)]]("makeBatScripts", "Creates start scripts for this project.")
+  val makeBatScripts =
+    taskKey[Seq[(PluginCompat.FileRef, String)]]("Creates start scripts for this project.")
   val batScriptTemplateLocation =
     TaskKey[File]("batScriptTemplateLocation", "The location of the bat script template.")
 
diff --git a/src/main/scala/com/typesafe/sbt/packager/archetypes/scripts/BatStartScriptPlugin.scala b/src/main/scala/com/typesafe/sbt/packager/archetypes/scripts/BatStartScriptPlugin.scala
index 09f8fa629..328370298 100644
--- a/src/main/scala/com/typesafe/sbt/packager/archetypes/scripts/BatStartScriptPlugin.scala
+++ b/src/main/scala/com/typesafe/sbt/packager/archetypes/scripts/BatStartScriptPlugin.scala
@@ -6,8 +6,9 @@ import com.typesafe.sbt.SbtNativePackager.Universal
 import com.typesafe.sbt.packager.Keys._
 import com.typesafe.sbt.packager.archetypes.{JavaAppPackaging, TemplateWriter}
 import com.typesafe.sbt.packager.windows.NameHelper
-import sbt.Keys._
-import sbt._
+import sbt.Keys.*
+import sbt.{*, given}
+import xsbti.FileConverter
 
 /**
   * ==Bat StartScript Plugin==
@@ -53,47 +54,6 @@ object BatStartScriptPlugin extends AutoPlugin with ApplicationIniGenerator with
     bundledJvmLocation: Option[String],
     override val forwarderTemplateLocation: Option[File]
   ) extends ScriptConfig {
-
-    @deprecated("1.3.21", "")
-    def this(
-      executableScriptName: String,
-      scriptClasspath: Seq[String],
-      configLocation: Option[String],
-      extraDefines: Seq[String],
-      replacements: Seq[(String, String)],
-      templateLocation: File
-    ) =
-      this(
-        executableScriptName,
-        scriptClasspath,
-        configLocation,
-        extraDefines,
-        replacements,
-        templateLocation,
-        None,
-        None
-      )
-
-    @deprecated("1.3.21", "")
-    def copy(
-      executableScriptName: String = executableScriptName,
-      scriptClasspath: Seq[String] = scriptClasspath,
-      configLocation: Option[String] = configLocation,
-      extraDefines: Seq[String] = extraDefines,
-      replacements: Seq[(String, String)] = replacements,
-      templateLocation: File = templateLocation
-    ): BatScriptConfig =
-      BatScriptConfig(
-        executableScriptName,
-        scriptClasspath,
-        configLocation,
-        extraDefines,
-        replacements,
-        templateLocation,
-        bundledJvmLocation,
-        forwarderTemplateLocation
-      )
-
     override def withScriptName(scriptName: String): BatScriptConfig = copy(executableScriptName = scriptName)
   }
 
@@ -134,13 +94,17 @@ object BatStartScriptPlugin extends AutoPlugin with ApplicationIniGenerator with
       batScriptExtraDefines := Nil,
       batScriptReplacements := Replacements(executableScriptName.value),
       // Generating the application configuration
-      Universal / mappings := generateApplicationIni(
-        (Universal / mappings).value,
-        (Universal / javaOptions).value,
-        batScriptConfigLocation.value,
-        (Universal / target).value,
-        streams.value.log
-      ),
+      Universal / mappings := {
+        val conv0 = fileConverter.value
+        implicit val conv: FileConverter = conv0
+        generateApplicationIni(
+          (Universal / mappings).value,
+          (Universal / javaOptions).value,
+          batScriptConfigLocation.value,
+          (Universal / target).value,
+          streams.value.log
+        )
+      },
       makeBatScripts := generateStartScripts(
         BatScriptConfig(
           executableScriptName = executableScriptName.value,
@@ -155,6 +119,7 @@ object BatStartScriptPlugin extends AutoPlugin with ApplicationIniGenerator with
         (Compile / batScriptReplacements / mainClass).value,
         (Compile / discoveredMainClasses).value,
         (Universal / target).value / "scripts",
+        fileConverter.value,
         streams.value.log
       ),
       Universal / mappings ++= makeBatScripts.value
diff --git a/src/main/scala/com/typesafe/sbt/packager/archetypes/scripts/CommonStartScriptGenerator.scala b/src/main/scala/com/typesafe/sbt/packager/archetypes/scripts/CommonStartScriptGenerator.scala
index f9de4b3c7..69e41cb4b 100644
--- a/src/main/scala/com/typesafe/sbt/packager/archetypes/scripts/CommonStartScriptGenerator.scala
+++ b/src/main/scala/com/typesafe/sbt/packager/archetypes/scripts/CommonStartScriptGenerator.scala
@@ -3,8 +3,10 @@ package com.typesafe.sbt.packager.archetypes.scripts
 import java.io.File
 import java.net.URL
 
+import com.typesafe.sbt.packager.PluginCompat
 import com.typesafe.sbt.packager.archetypes.TemplateWriter
-import sbt._
+import sbt.{*, given}
+import xsbti.FileConverter
 
 trait CommonStartScriptGenerator {
 
@@ -67,27 +69,29 @@ trait CommonStartScriptGenerator {
     mainClass: Option[String],
     discoveredMainClasses: Seq[String],
     targetDir: File,
+    conv: FileConverter,
     log: sbt.Logger
-  ): Seq[(File, String)] =
+  ): Seq[(PluginCompat.FileRef, String)] =
     StartScriptMainClassConfig.from(mainClass, discoveredMainClasses) match {
       case NoMain =>
         log.warn("You have no main class in your project. No start script will be generated.")
         Seq.empty
       case SingleMain(main) =>
-        Seq(createMainScript(main, config, targetDir, Seq(main)))
+        Seq(createMainScript(main, config, targetDir, Seq(main), conv))
       case MultipleMains(mains) =>
-        generateMainScripts(mains, config, targetDir, log)
+        generateMainScripts(mains, config, targetDir, conv, log)
       case ExplicitMainWithAdditional(main, additional) =>
-        createMainScript(main, config, targetDir, discoveredMainClasses) +:
-          createForwarderScripts(config.executableScriptName, additional, targetDir, config, log)
+        createMainScript(main, config, targetDir, discoveredMainClasses, conv) +:
+          createForwarderScripts(config.executableScriptName, additional, targetDir, config, conv, log)
     }
 
   private[this] def generateMainScripts(
     discoveredMainClasses: Seq[String],
     config: SpecializedScriptConfig,
     targetDir: File,
+    conv: FileConverter,
     log: sbt.Logger
-  ): Seq[(File, String)] = {
+  ): Seq[(PluginCompat.FileRef, String)] = {
     val classAndScriptNames = ScriptUtils.createScriptNames(discoveredMainClasses)
     ScriptUtils.warnOnScriptNameCollision(classAndScriptNames, log)
 
@@ -101,7 +105,7 @@ trait CommonStartScriptGenerator {
       ) // empty string to enforce the custom class in scripts
       .map { case (qualifiedClassName, scriptName) =>
         val newConfig = config.withScriptName(scriptName)
-        createMainScript(qualifiedClassName, newConfig, targetDir, discoveredMainClasses)
+        createMainScript(qualifiedClassName, newConfig, targetDir, discoveredMainClasses, conv)
       }
   }
 
@@ -122,8 +126,10 @@ trait CommonStartScriptGenerator {
     mainClass: String,
     config: SpecializedScriptConfig,
     targetDir: File,
-    mainClasses: Seq[String]
-  ): (File, String) = {
+    mainClasses: Seq[String],
+    conv0: FileConverter
+  ): (PluginCompat.FileRef, String) = {
+    implicit val conv: FileConverter = conv0
     val template = resolveTemplate(config.templateLocation)
     val replacements = createReplacementsForMainScript(mainClass, mainClasses, config)
     val scriptContent = TemplateWriter.generateScript(template, replacements, eol, keySurround)
@@ -133,7 +139,8 @@ trait CommonStartScriptGenerator {
     IO.write(script, scriptContent)
     // TODO - Better control over this!
     script.setExecutable(executableBitValue)
-    script -> s"$scriptTargetFolder/$scriptNameWithSuffix"
+    val scriptRef = PluginCompat.toFileRef(script)
+    scriptRef -> s"$scriptTargetFolder/$scriptNameWithSuffix"
   }
 
   private[this] def resolveTemplate(templateLocation: File): URL =
@@ -145,8 +152,10 @@ trait CommonStartScriptGenerator {
     discoveredMainClasses: Seq[String],
     targetDir: File,
     config: ScriptConfig,
+    conv0: FileConverter,
     log: sbt.Logger
-  ): Seq[(File, String)] = {
+  ): Seq[(PluginCompat.FileRef, String)] = {
+    implicit val conv: FileConverter = conv0
     val tmp = targetDir / scriptTargetFolder
     val forwarderTemplate =
       config.forwarderTemplateLocation.map(resolveTemplate).getOrElse(getClass.getResource(forwarderTemplateName))
@@ -161,7 +170,8 @@ trait CommonStartScriptGenerator {
 
       IO.write(file, scriptContent)
       file.setExecutable(executableBitValue)
-      file -> s"$scriptTargetFolder/$scriptName"
+      val fileRef = PluginCompat.toFileRef(file)
+      fileRef -> s"$scriptTargetFolder/$scriptName"
     }
   }
 }
diff --git a/src/main/scala/com/typesafe/sbt/packager/archetypes/systemloader/SystemdPlugin.scala b/src/main/scala/com/typesafe/sbt/packager/archetypes/systemloader/SystemdPlugin.scala
index 7a6a28307..6b23b0100 100644
--- a/src/main/scala/com/typesafe/sbt/packager/archetypes/systemloader/SystemdPlugin.scala
+++ b/src/main/scala/com/typesafe/sbt/packager/archetypes/systemloader/SystemdPlugin.scala
@@ -1,6 +1,6 @@
 package com.typesafe.sbt.packager.archetypes.systemloader
 
-import sbt._
+import sbt.{*, given}
 import sbt.Keys.{sourceDirectory, target}
 import com.typesafe.sbt.packager.Keys.{
   defaultLinuxStartScriptLocation,
@@ -19,6 +19,7 @@ import com.typesafe.sbt.packager.Keys.{
   stopRunlevels
 }
 import com.typesafe.sbt.SbtNativePackager.{Debian, Linux, Rpm, Universal}
+import com.typesafe.sbt.packager.PluginCompat
 import com.typesafe.sbt.packager.archetypes.MaintainerScriptHelper.maintainerScriptsAppend
 import com.typesafe.sbt.packager.debian.DebianPlugin
 import com.typesafe.sbt.packager.debian.DebianPlugin.autoImport.DebianConstants
diff --git a/src/main/scala/com/typesafe/sbt/packager/archetypes/systemloader/SystemloaderPlugin.scala b/src/main/scala/com/typesafe/sbt/packager/archetypes/systemloader/SystemloaderPlugin.scala
index 61a84ac8c..1f1d6f5fc 100644
--- a/src/main/scala/com/typesafe/sbt/packager/archetypes/systemloader/SystemloaderPlugin.scala
+++ b/src/main/scala/com/typesafe/sbt/packager/archetypes/systemloader/SystemloaderPlugin.scala
@@ -1,7 +1,7 @@
 package com.typesafe.sbt.packager.archetypes.systemloader
 
-import sbt._
-import sbt.Keys.{sourceDirectory, target}
+import sbt.{*, given}
+import sbt.Keys.{fileConverter, sourceDirectory, target}
 import com.typesafe.sbt.SbtNativePackager.{Debian, Rpm}
 import com.typesafe.sbt.packager.Keys.{
   defaultLinuxStartScriptLocation,
diff --git a/src/main/scala/com/typesafe/sbt/packager/archetypes/systemloader/package.scala b/src/main/scala/com/typesafe/sbt/packager/archetypes/systemloader/package.scala
index 5c94ae8b6..cd6a01aef 100644
--- a/src/main/scala/com/typesafe/sbt/packager/archetypes/systemloader/package.scala
+++ b/src/main/scala/com/typesafe/sbt/packager/archetypes/systemloader/package.scala
@@ -1,13 +1,15 @@
 package com.typesafe.sbt.packager.archetypes
 
-import sbt._
+import sbt.{*, given}
 import java.io.File
 import java.net.URL
 
+import com.typesafe.sbt.packager.PluginCompat
 import com.typesafe.sbt.packager.linux._
 import com.typesafe.sbt.packager.linux.LinuxPlugin.Users
 
 import com.typesafe.sbt.packager.archetypes.systemloader.ServerLoader._
+import xsbti.FileConverter
 
 package object systemloader {
 
diff --git a/src/main/scala/com/typesafe/sbt/packager/debian/DebianNativePackaging.scala b/src/main/scala/com/typesafe/sbt/packager/debian/DebianNativePackaging.scala
index 445f4e7d9..91e8454c3 100644
--- a/src/main/scala/com/typesafe/sbt/packager/debian/DebianNativePackaging.scala
+++ b/src/main/scala/com/typesafe/sbt/packager/debian/DebianNativePackaging.scala
@@ -1,11 +1,13 @@
-package com.typesafe.sbt.packager.debian
+package com.typesafe.sbt.packager
+package debian
 
 import com.typesafe.sbt.SbtNativePackager.Debian
 import com.typesafe.sbt.packager.Keys._
 import com.typesafe.sbt.packager.linux.LinuxFileMetaData
 import com.typesafe.sbt.packager.Compat._
-import sbt.Keys._
-import sbt._
+import sbt.Keys.*
+import sbt.{*, given}
+import xsbti.FileConverter
 
 /**
   * ==Native Packaging==
@@ -36,17 +38,20 @@ trait DebianNativePackaging extends DebianPluginLike {
     inConfig(Debian)(
       Seq(
         debianNativeBuildOptions += "-Znone", // packages are largely JARs, which are already compressed
-        genChanges := dpkgGenChanges(
-          packageBin.value,
-          debianChangelog.value,
-          debianPackageMetadata.value,
-          target.value
-        ),
+        genChanges := {
+          val conv0 = fileConverter.value
+          implicit val conv: FileConverter = conv0
+          dpkgGenChanges(packageBin.value, debianChangelog.value, debianPackageMetadata.value, target.value)
+        },
         debianSign := {
+          val conv0 = fileConverter.value
+          implicit val conv: FileConverter = conv0
           val deb = packageBin.value
+          val debFile = PluginCompat.toFile(deb)
           val role = debianSignRole.value
           val log = streams.value.log
-          sys.process.Process(Seq("dpkg-sig", "-s", role, deb.getAbsolutePath), Some(deb.getParentFile)) ! log match {
+          sys.process
+            .Process(Seq("dpkg-sig", "-s", role, debFile.getAbsolutePath), Some(debFile.getParentFile)) ! log match {
             case 0 => ()
             case x =>
               sys.error("Failed to sign debian package! exit code: " + x)
@@ -54,8 +59,11 @@ trait DebianNativePackaging extends DebianPluginLike {
           deb
         },
         lintian := {
-          val file = packageBin.value
-          sys.process.Process(Seq("lintian", "-c", "-v", file.getName), Some(file.getParentFile)).!
+          val conv0 = fileConverter.value
+          implicit val conv: FileConverter = conv0
+          val deb = packageBin.value
+          val debFile = PluginCompat.toFile(deb)
+          sys.process.Process(Seq("lintian", "-c", "-v", debFile.getName), Some(debFile.getParentFile)).!
         },
         /** Implementation of the actual packaging */
         packageBin := buildPackage(
@@ -64,12 +72,18 @@ trait DebianNativePackaging extends DebianPluginLike {
           packageArchitecture.value,
           stage.value,
           debianNativeBuildOptions.value,
+          fileConverter.value,
           streams.value.log
         )
       )
     )
 
-  private[this] def dpkgGenChanges(debFile: File, changelog: Option[File], data: PackageMetaData, targetDir: File) = {
+  private[this] def dpkgGenChanges(
+    debFile: PluginCompat.FileRef,
+    changelog: Option[File],
+    data: PackageMetaData,
+    targetDir: File
+  )(implicit conv: FileConverter): PluginCompat.FileRef = {
     println(s"Changelog: $changelog")
     changelog match {
       case None =>
@@ -79,10 +93,11 @@ trait DebianNativePackaging extends DebianPluginLike {
         val debSrc = targetDir / "../tmp" / Names.DebianSource
         debSrc.mkdirs()
         copyAndFixPerms(chlog, debSrc / Names.Changelog, LinuxFileMetaData("0644"))
-        IO.writeLines(debSrc / Names.Files, List(debFile.getName + " " + data.section + " " + data.priority))
+        val debFileFile = PluginCompat.toFile(debFile)
+        IO.writeLines(debSrc / Names.Files, List(debFileFile.getName + " " + data.section + " " + data.priority))
         // dpkg-genchanges needs a "source" control file, located in a "debian" directory
         IO.writeLines(debSrc / Names.Control, List(data.makeSourceControl()))
-        val changesFileName = debFile.getName.replaceAll("deb$", "changes")
+        val changesFileName = debFileFile.getName.replaceAll("deb$", "changes")
         val changesFile: File = targetDir / ".." / changesFileName
         try {
           val changes = sys.process.Process(Seq("dpkg-genchanges", "-b"), Some(targetDir / "../tmp")).!!
@@ -92,7 +107,8 @@ trait DebianNativePackaging extends DebianPluginLike {
           case e: Exception =>
             throw new RuntimeException("Failure generating changes file.", e)
         }
-        changesFile
+        val changesFileRef = PluginCompat.toFileRef(changesFile)
+        changesFileRef
     }
   }
 
@@ -102,8 +118,10 @@ trait DebianNativePackaging extends DebianPluginLike {
     arch: String,
     stageDir: File,
     buildOptions: Seq[String],
+    conv0: FileConverter,
     log: Logger
-  ) = {
+  ): PluginCompat.FileRef = {
+    implicit val conv: FileConverter = conv0
     log.info("Building debian package with native implementation")
     // Make the package.  We put this in fakeroot, so we can build the package with root owning files.
     val archive = archiveFilename(name, version, arch)
@@ -115,7 +133,8 @@ trait DebianNativePackaging extends DebianPluginLike {
       case x =>
         sys.error("Failure packaging debian file.  Exit code: " + x)
     }
-    stageDir / ".." / archive
+    val out = stageDir / ".." / archive
+    PluginCompat.toFileRef(out)
   }
 
 }
diff --git a/src/main/scala/com/typesafe/sbt/packager/debian/DebianPlugin.scala b/src/main/scala/com/typesafe/sbt/packager/debian/DebianPlugin.scala
index de4760bb1..3d76a7da3 100644
--- a/src/main/scala/com/typesafe/sbt/packager/debian/DebianPlugin.scala
+++ b/src/main/scala/com/typesafe/sbt/packager/debian/DebianPlugin.scala
@@ -1,4 +1,5 @@
-package com.typesafe.sbt.packager.debian
+package com.typesafe.sbt.packager
+package debian
 
 import com.typesafe.sbt.SbtNativePackager.{Linux, Universal}
 import com.typesafe.sbt.packager.Keys._
@@ -8,8 +9,9 @@ import com.typesafe.sbt.packager.linux.{LinuxFileMetaData, LinuxPackageMapping,
 import com.typesafe.sbt.packager.universal.Archives
 import com.typesafe.sbt.packager.validation._
 import com.typesafe.sbt.packager.{chmod, Hashing, SettingsHelper}
-import sbt.Keys._
-import sbt._
+import sbt.Keys.*
+import sbt.{*, given}
+import xsbti.FileConverter
 
 import scala.util.matching.Regex
 
@@ -154,7 +156,7 @@ object DebianPlugin extends AutoPlugin with DebianNativePackaging {
         // apply all replacements
         content.mapValues { lines =>
           TemplateWriter.generateScriptFromLines(lines, replacements)
-        }
+        }.toMap
       },
       debianMaintainerScripts := generateDebianMaintainerScripts(
         (Debian / maintainerScripts).value,
@@ -189,12 +191,22 @@ object DebianPlugin extends AutoPlugin with DebianNativePackaging {
           debianPackageProvides.value,
           debianPackageRecommends.value
         ),
-        debianPackageInstallSize := getPackageInstallSize(linuxPackageMappings.value),
+        debianPackageInstallSize := {
+          val conv0 = fileConverter.value
+          implicit val conv: FileConverter = conv0
+          getPackageInstallSize(linuxPackageMappings.value)
+        },
         debianControlFile := createConfFile(debianPackageMetadata.value, debianPackageInstallSize.value, target.value),
-        debianConffilesFile := createConffilesFile(linuxPackageMappings.value, target.value),
+        debianConffilesFile := {
+          val conv0 = fileConverter.value
+          implicit val conv: FileConverter = conv0
+          createConffilesFile(linuxPackageMappings.value, target.value)
+        },
         debianMD5sumsFile := createMD5SumFile(stage.value),
         debianMakeChownReplacements := makeChownReplacements(linuxPackageMappings.value, streams.value),
         stage := {
+          val conv0 = fileConverter.value
+          implicit val conv: FileConverter = conv0
           val debianTarget = target.value
 
           stageMappings(linuxPackageMappings.value, debianTarget)
@@ -272,7 +284,7 @@ object DebianPlugin extends AutoPlugin with DebianNativePackaging {
       dirs map { case (_, dirName) =>
         targetDir / dirName
       } foreach { targetDir =>
-        targetDir mkdirs ()
+        targetDir.mkdirs()
         chmod(targetDir, perms.permissions)
       }
 
diff --git a/src/main/scala/com/typesafe/sbt/packager/debian/JDebPackaging.scala b/src/main/scala/com/typesafe/sbt/packager/debian/JDebPackaging.scala
index b68f1c549..374510914 100644
--- a/src/main/scala/com/typesafe/sbt/packager/debian/JDebPackaging.scala
+++ b/src/main/scala/com/typesafe/sbt/packager/debian/JDebPackaging.scala
@@ -1,9 +1,11 @@
-package com.typesafe.sbt.packager.debian
+package com.typesafe.sbt.packager
+package debian
 
+import com.typesafe.sbt.packager.PluginCompat
 import com.typesafe.sbt.packager.archetypes.TemplateWriter
 import com.typesafe.sbt.packager.universal.Archives
-import sbt._
-import sbt.Keys.{classpathTypes, normalizedName, packageBin, streams, target, version}
+import sbt.{*, given}
+import sbt.Keys.{classpathTypes, fileConverter, normalizedName, packageBin, streams, target, version}
 import com.typesafe.sbt.packager.linux.{LinuxFileMetaData, LinuxPackageMapping, LinuxSymlink}
 import com.typesafe.sbt.packager.linux.LinuxPlugin.autoImport.{
   linuxPackageMappings,
@@ -14,6 +16,7 @@ import com.typesafe.sbt.packager.linux.LinuxPlugin.autoImport.{
 import scala.collection.JavaConverters._
 import DebianPlugin.Names
 import DebianPlugin.autoImport._
+import xsbti.FileConverter
 
 /**
   * ==JDeb Plugin==
@@ -58,6 +61,8 @@ object JDebPackaging extends AutoPlugin with DebianPluginLike {
         * Depends on the 'debianExplodedPackage' task as this creates all the files which are defined in the mappings.
         */
       packageBin := {
+        val conv0 = fileConverter.value
+        implicit val conv: FileConverter = conv0
         val targetDir = target.value
         val log = streams.value.log
         val mappings = linuxPackageMappings.value
@@ -80,8 +85,8 @@ object JDebPackaging extends AutoPlugin with DebianPluginLike {
         val archive = archiveFilename(normalizedName.value, version.value, packageArchitecture.value)
         val debianFile = targetDir.getParentFile / archive
         val debMaker = new JDebPackagingTask()
-        debMaker.packageDebian(mappings, symlinks, debianFile, targetDir, log)
-        debianFile
+        debMaker.packageDebian(mappings, symlinks, debianFile, targetDir, fileConverter.value, log)
+        PluginCompat.toFileRef(debianFile)
       },
       packageBin := (packageBin dependsOn debianControlFile).value,
       packageBin := (packageBin dependsOn debianConffilesFile).value,
@@ -147,8 +152,10 @@ private class JDebPackagingTask {
     symlinks: Seq[LinuxSymlink],
     debianFile: File,
     targetDir: File,
+    conv0: FileConverter,
     log: Logger
   ): Unit = {
+    implicit val conv: FileConverter = conv0
     val debMaker = new DebMaker(
       new JDebConsole(log),
       (fileAndDirectoryProducers(mappings, targetDir) ++ linkProducers(symlinks)).asJava,
@@ -161,8 +168,8 @@ private class JDebPackagingTask {
     debMaker setControl (targetDir / Names.DebianMaintainerScripts)
 
     // TODO add signing with setKeyring, setKey, setPassphrase, setSignPackage, setSignMethod, setSignRole
-    debMaker validate ()
-    debMaker makeDeb ()
+    debMaker.validate()
+    debMaker.makeDeb()
   }
 
   /**
@@ -176,7 +183,7 @@ private class JDebPackagingTask {
         // Directories need to be created so jdeb can pick them up
         case (path, name) if path.isDirectory =>
           val permMapper = new PermMapper(-1, -1, perms.user, perms.group, null, perms.permissions, -1, null)
-          (target / cleanPath(name)) mkdirs ()
+          (target / cleanPath(name)).mkdirs()
           new DataProducerDirectory(target, Array(cleanPath(name)), null, Array(permMapper))
 
         // Files are just referenced
diff --git a/src/main/scala/com/typesafe/sbt/packager/debian/Keys.scala b/src/main/scala/com/typesafe/sbt/packager/debian/Keys.scala
index 21cd2cd29..7b7d936e7 100644
--- a/src/main/scala/com/typesafe/sbt/packager/debian/Keys.scala
+++ b/src/main/scala/com/typesafe/sbt/packager/debian/Keys.scala
@@ -2,7 +2,7 @@ package com.typesafe.sbt
 package packager
 package debian
 
-import sbt._
+import sbt.{*, given}
 import linux.LinuxPackageMapping
 
 /** DEB packaging specifc build targets. */
@@ -43,10 +43,12 @@ trait DebianKeys {
   @deprecated("Use Debian/stage instead", "1.2.0")
   val debianExplodedPackage = TaskKey[File]("debian-exploded-package", "makes an exploded debian package")
   val lintian = TaskKey[Unit]("lintian", "runs the debian lintian tool on the current package.")
-  val debianSign = TaskKey[File]("debian-sign", "runs the dpkg-sig command to sign the generated deb file.")
+  val debianSign =
+    taskKey[PluginCompat.FileRef]("runs the dpkg-sig command to sign the generated deb file.")
   val debianSignRole =
     SettingKey[String]("debian-sign-role", "The role to use when signing a debian file (defaults to 'builder').")
-  val genChanges = TaskKey[File]("gen-changes", "runs the dpkg-genchanges command to generate the .changes file.")
+  val genChanges =
+    taskKey[PluginCompat.FileRef]("runs the dpkg-genchanges command to generate the .changes file.")
 
   // Debian control scripts
   val debianControlScriptsDirectory = SettingKey[File](
diff --git a/src/main/scala/com/typesafe/sbt/packager/docker/DockerPlugin.scala b/src/main/scala/com/typesafe/sbt/packager/docker/DockerPlugin.scala
index 7175085bd..92a476c23 100644
--- a/src/main/scala/com/typesafe/sbt/packager/docker/DockerPlugin.scala
+++ b/src/main/scala/com/typesafe/sbt/packager/docker/DockerPlugin.scala
@@ -1,4 +1,5 @@
-package com.typesafe.sbt.packager.docker
+package com.typesafe.sbt.packager
+package docker
 
 import com.typesafe.sbt.SbtNativePackager.Universal
 import com.typesafe.sbt.packager.Keys._
@@ -7,15 +8,15 @@ import com.typesafe.sbt.packager.linux.LinuxPlugin.autoImport.{daemonUser, defau
 import com.typesafe.sbt.packager.universal.UniversalPlugin
 import com.typesafe.sbt.packager.universal.UniversalPlugin.autoImport.stage
 import com.typesafe.sbt.packager.validation._
-import com.typesafe.sbt.packager.{MappingsHelper, Stager}
-import sbt.Keys._
-import sbt._
+import sbt.Keys.*
+import sbt.{*, given}
 
 import java.io.File
 import java.util.UUID
 import java.util.concurrent.atomic.AtomicBoolean
 import scala.sys.process.Process
 import scala.util.Try
+import xsbti.FileConverter
 
 /**
   * ==Docker Plugin==
@@ -101,10 +102,12 @@ object DockerPlugin extends AutoPlugin {
       (Docker / packageName).value,
       Option((Docker / version).value)
     ),
-    dockerLayerGrouping := { _: String =>
+    dockerLayerGrouping := { (_: String) =>
       None
     },
     dockerGroupLayers := {
+      val conv0 = fileConverter.value
+      implicit val conv: FileConverter = conv0
       val dockerBaseDirectory = (Docker / defaultLinuxInstallLocation).value
       // Ensure this doesn't break even if the JvmPlugin isn't enabled.
       var artifacts = projectDependencyArtifacts.?.value.getOrElse(Nil).map(_.data).toSet
@@ -119,7 +122,7 @@ object DockerPlugin extends AutoPlugin {
       val oldFunction = dockerLayerGrouping.value
 
       // By default we set this to a function that always returns None.
-      val oldPartialFunction = Function.unlift((tuple: (File, String)) => oldFunction(tuple._2))
+      val oldPartialFunction = Function.unlift((tuple: (PluginCompat.FileRef, String)) => oldFunction(tuple._2))
 
       val libDir = dockerBaseDirectory + "/lib/"
       val binDir = dockerBaseDirectory + "/bin/"
@@ -183,6 +186,8 @@ object DockerPlugin extends AutoPlugin {
         }
     },
     dockerCommands := {
+      val conv0 = fileConverter.value
+      implicit val conv: FileConverter = conv0
       val strategy = dockerPermissionStrategy.value
       val dockerBaseDirectory = (Docker / defaultLinuxInstallLocation).value
       val user = (Docker / daemonUser).value
@@ -220,7 +225,7 @@ object DockerPlugin extends AutoPlugin {
                   .getOrElse {
                     // We couldn't find a source file for the mapping, so try with a dummy source file,
                     // in case there is an explicitly configured path based layer mapping, eg for a directory.
-                    layerToPath.lift((new File("/dev/null"), v))
+                    layerToPath.lift((PluginCompat.toFileRef(new File("/dev/null")), v))
                   }
                 makeChmod(tpe, Seq(pathInLayer(v, layerId)))
               }
@@ -325,13 +330,17 @@ object DockerPlugin extends AutoPlugin {
       publish := publishTask.value,
       clean := cleanTask.value,
       sourceDirectory := sourceDirectory.value / "docker",
-      stage := Stager.stage(Docker.name)(
-        streams.value,
-        stagingDirectory.value,
-        dockerLayerMappings.value.map { case LayeredMapping(layerIdx, file, path) =>
-          (file, pathInLayer(path, layerIdx))
-        }
-      ),
+      stage := {
+        val conv0 = fileConverter.value
+        implicit val conv: FileConverter = conv0
+        Stager.stage(Docker.name)(
+          streams.value,
+          stagingDirectory.value,
+          dockerLayerMappings.value.map { case LayeredMapping(layerIdx, file, path) =>
+            (file, pathInLayer(path, layerIdx))
+          }
+        )
+      },
       stage := (stage dependsOn dockerGenerateConfig).value,
       stagingDirectory := (Docker / target).value / "stage",
       dockerLayerMappings := {
@@ -352,14 +361,20 @@ object DockerPlugin extends AutoPlugin {
       defaultLinuxInstallLocation := "/opt/docker",
       validatePackage := Validation
         .runAndThrow(validatePackageValidators.value, streams.value.log),
-      validatePackageValidators := Seq(
-        nonEmptyMappings((Docker / mappings).value),
-        filesExist((Docker / mappings).value),
-        validateExposedPorts(dockerExposedPorts.value, dockerExposedUdpPorts.value),
-        validateDockerVersion(dockerApiVersion.value),
-        validateDockerPermissionStrategy(dockerPermissionStrategy.value, dockerVersion.value, dockerApiVersion.value)
-      ),
-      dockerPackageMappings := MappingsHelper.contentOf(sourceDirectory.value),
+      validatePackageValidators := {
+        val conv0 = fileConverter.value
+        implicit val conv: FileConverter = conv0
+        val xs = (Docker / mappings).value
+        val fileMappings = xs.map { case (ref, p) => PluginCompat.toFile(ref) -> p }
+        Seq(
+          nonEmptyMappings(fileMappings),
+          filesExist(fileMappings),
+          validateExposedPorts(dockerExposedPorts.value, dockerExposedUdpPorts.value),
+          validateDockerVersion(dockerApiVersion.value),
+          validateDockerPermissionStrategy(dockerPermissionStrategy.value, dockerVersion.value, dockerApiVersion.value)
+        )
+      },
+      dockerPackageMappings := MappingsHelper.contentOf(sourceDirectory.value, fileConverter.value),
       dockerGenerateConfig := {
         val _ = validatePackage.value
         generateDockerConfig(dockerCommands.value, stagingDirectory.value)
@@ -628,7 +643,7 @@ object DockerPlugin extends AutoPlugin {
     * uses the `Universal / mappings` to generate the `Docker / mappings`.
     */
   def mapGenericFilesToDocker: Seq[Setting[_]] = {
-    def renameDests(from: Seq[(File, String)], dest: String) =
+    def renameDests(from: Seq[(PluginCompat.FileRef, String)], dest: String) =
       for {
         (f, path) <- from
         pathWithValidSeparator = if (Path.sep == '/') path else path.replace(Path.sep, '/')
diff --git a/src/main/scala/com/typesafe/sbt/packager/docker/Keys.scala b/src/main/scala/com/typesafe/sbt/packager/docker/Keys.scala
index 6300dd323..d34126136 100644
--- a/src/main/scala/com/typesafe/sbt/packager/docker/Keys.scala
+++ b/src/main/scala/com/typesafe/sbt/packager/docker/Keys.scala
@@ -11,7 +11,7 @@ import sbt._
 trait DockerKeys {
   val dockerGenerateConfig = TaskKey[File]("docker-generate-config", "Generates configuration file for Docker.")
   val dockerPackageMappings =
-    TaskKey[Seq[(File, String)]]("docker-package-mappings", "Generates location mappings for Docker build.")
+    taskKey[Seq[(PluginCompat.FileRef, String)]]("Generates location mappings for Docker build.")
 
   val dockerBaseImage =
     SettingKey[String]("dockerBaseImage", "Base image for Dockerfile.")
@@ -64,7 +64,7 @@ private[packager] trait DockerKeysEx extends DockerKeys {
     "Group files by path into in layers to increase docker cache hits. " +
       "Lower index means the file would be a part of an earlier layer."
   )
-  val dockerGroupLayers = taskKey[PartialFunction[(File, String), Int]](
+  val dockerGroupLayers = taskKey[PartialFunction[(PluginCompat.FileRef, String), Int]](
     "Group files by mapping into layers to increase docker cache hits. " +
       "Lower index means the file would be a part of an earlier layer."
   )
diff --git a/src/main/scala/com/typesafe/sbt/packager/docker/LayeredMapping.scala b/src/main/scala/com/typesafe/sbt/packager/docker/LayeredMapping.scala
index 96824a6e3..585864044 100644
--- a/src/main/scala/com/typesafe/sbt/packager/docker/LayeredMapping.scala
+++ b/src/main/scala/com/typesafe/sbt/packager/docker/LayeredMapping.scala
@@ -1,4 +1,5 @@
-package com.typesafe.sbt.packager.docker
+package com.typesafe.sbt.packager
+package docker
 
 import java.io.File
 
@@ -14,4 +15,4 @@ import java.io.File
   * @param path
   *   The path in the final image
   */
-case class LayeredMapping(layerId: Option[Int], file: File, path: String)
+case class LayeredMapping(layerId: Option[Int], file: PluginCompat.FileRef, path: String)
diff --git a/src/main/scala/com/typesafe/sbt/packager/docker/dockerfile.scala b/src/main/scala/com/typesafe/sbt/packager/docker/dockerfile.scala
index 87021d3a3..654cc5046 100644
--- a/src/main/scala/com/typesafe/sbt/packager/docker/dockerfile.scala
+++ b/src/main/scala/com/typesafe/sbt/packager/docker/dockerfile.scala
@@ -94,6 +94,6 @@ case class Dockerfile(commands: CmdLike*) {
   def makeContent: String = {
     val sb = new StringBuilder
     commands foreach { sb append _.makeContent }
-    sb toString
+    sb.toString()
   }
 }
diff --git a/src/main/scala/com/typesafe/sbt/packager/graalvmnativeimage/GraalVMNativeImagePlugin.scala b/src/main/scala/com/typesafe/sbt/packager/graalvmnativeimage/GraalVMNativeImagePlugin.scala
index e1ddbf3db..184caf3c0 100644
--- a/src/main/scala/com/typesafe/sbt/packager/graalvmnativeimage/GraalVMNativeImagePlugin.scala
+++ b/src/main/scala/com/typesafe/sbt/packager/graalvmnativeimage/GraalVMNativeImagePlugin.scala
@@ -1,15 +1,18 @@
-package com.typesafe.sbt.packager.graalvmnativeimage
+package com.typesafe.sbt.packager
+package graalvmnativeimage
 
 import java.io.ByteArrayInputStream
 
-import sbt._
-import sbt.Keys.{mainClass, name, _}
 import com.typesafe.sbt.packager.{MappingsHelper, Stager}
-import com.typesafe.sbt.packager.Keys._
-import com.typesafe.sbt.packager.Compat._
+import com.typesafe.sbt.packager.Keys.*
+import com.typesafe.sbt.packager.Compat.*
 import com.typesafe.sbt.packager.archetypes.JavaAppPackaging
 import com.typesafe.sbt.packager.docker.{Cmd, DockerPlugin, Dockerfile, ExecCmd}
 import com.typesafe.sbt.packager.universal.UniversalPlugin
+import sbt.{*, given}
+import sbt.Keys.{mainClass, name, _}
+import scala.sys.process.ProcessLogger
+import xsbti.FileConverter
 
 /**
   * Plugin to compile ahead-of-time native executables.
@@ -46,7 +49,7 @@ object GraalVMNativeImagePlugin extends AutoPlugin {
   private lazy val scopedSettings = Seq[Setting[_]](
     resourceDirectories := Seq(resourceDirectory.value),
     includeFilter := "*",
-    resources := resourceDirectories.value.descendantsExcept(includeFilter.value, excludeFilter.value).get,
+    resources := resourceDirectories.value.descendantsExcept(includeFilter.value, excludeFilter.value).get(),
     UniversalPlugin.autoImport.containerBuildImage := Def.taskDyn {
       graalVMNativeImageGraalVersion.value match {
         case Some(tag) => generateContainerBuildImage(s"$GraalVMBaseImage:$tag")
@@ -54,6 +57,8 @@ object GraalVMNativeImagePlugin extends AutoPlugin {
       }
     }.value,
     packageBin := {
+      val conv0 = fileConverter.value
+      implicit val conv: FileConverter = conv0
       val targetDirectory = target.value
       val binaryName = name.value
       val nativeImageCommand = graalVMNativeImageCommand.value
@@ -67,20 +72,21 @@ object GraalVMNativeImagePlugin extends AutoPlugin {
 
       UniversalPlugin.autoImport.containerBuildImage.value match {
         case None =>
-          buildLocal(
+          val file = buildLocal(
             targetDirectory,
             binaryName,
             nativeImageCommand,
             className,
-            classpathJars.map(_._1),
+            classpathJars.map(x => PluginCompat.toFile(x._1)),
             extraOptions,
             UnbufferedProcessLogger(streams.log)
           )
+          PluginCompat.toFileRef(file)
 
         case Some(image) =>
-          val resourceMappings = MappingsHelper.relative(graalResources, graalResourceDirectories)
+          val resourceMappings = MappingsHelper.relative(graalResources, graalResourceDirectories, conv)
 
-          buildInDockerContainer(
+          val file = buildInDockerContainer(
             targetDirectory,
             binaryName,
             className,
@@ -89,8 +95,10 @@ object GraalVMNativeImagePlugin extends AutoPlugin {
             dockerCommand,
             resourceMappings,
             image,
+            conv,
             streams
           )
+          PluginCompat.toFileRef(file)
       }
     }
   )
@@ -130,14 +138,15 @@ object GraalVMNativeImagePlugin extends AutoPlugin {
     targetDirectory: File,
     binaryName: String,
     className: String,
-    classpathJars: Seq[(File, String)],
+    classpathJars: Seq[(PluginCompat.FileRef, String)],
     extraOptions: Seq[String],
     dockerCommand: Seq[String],
-    resources: Seq[(File, String)],
+    resources: Seq[(PluginCompat.FileRef, String)],
     image: String,
+    conv0: FileConverter,
     streams: TaskStreams
   ): File = {
-
+    implicit val conv: FileConverter = conv0
     stage(targetDirectory, classpathJars, resources, streams)
 
     val graalDestDir = "/opt/graalvm"
@@ -212,10 +221,10 @@ object GraalVMNativeImagePlugin extends AutoPlugin {
 
   private def stage(
     targetDirectory: File,
-    classpathJars: Seq[(File, String)],
-    resources: Seq[(File, String)],
+    classpathJars: Seq[(PluginCompat.FileRef, String)],
+    resources: Seq[(PluginCompat.FileRef, String)],
     streams: TaskStreams
-  ): File = {
+  )(implicit conv: FileConverter): File = {
     val stageDir = targetDirectory / "stage"
     val mappings = classpathJars ++ resources.map { case (resource, path) =>
       resource -> s"resources/$path"
diff --git a/src/main/scala/com/typesafe/sbt/packager/jar/ClasspathJarPlugin.scala b/src/main/scala/com/typesafe/sbt/packager/jar/ClasspathJarPlugin.scala
index 7185aae56..5036957c8 100644
--- a/src/main/scala/com/typesafe/sbt/packager/jar/ClasspathJarPlugin.scala
+++ b/src/main/scala/com/typesafe/sbt/packager/jar/ClasspathJarPlugin.scala
@@ -4,8 +4,9 @@ import java.io.File
 import java.util.jar.Attributes
 
 import sbt.Package.ManifestAttributes
-import sbt._
+import sbt.{*, given}
 import sbt.Keys._
+import com.typesafe.sbt.packager.PluginCompat
 import com.typesafe.sbt.packager.Keys._
 import com.typesafe.sbt.SbtNativePackager.Universal
 import com.typesafe.sbt.packager.archetypes.JavaAppPackaging
@@ -13,10 +14,8 @@ import com.typesafe.sbt.packager.archetypes.JavaAppPackaging
 object ClasspathJarPlugin extends AutoPlugin {
 
   object autoImport {
-    val packageJavaClasspathJar: TaskKey[File] = TaskKey[File](
-      "packageJavaClasspathJar",
-      "Creates a Java classpath jar that specifies the classpath in its manifest"
-    )
+    val packageJavaClasspathJar: TaskKey[PluginCompat.FileRef] =
+      taskKey[PluginCompat.FileRef]("Creates a Java classpath jar that specifies the classpath in its manifest")
   }
   import autoImport._
 
@@ -28,18 +27,22 @@ object ClasspathJarPlugin extends AutoPlugin {
     packageJavaClasspathJar / artifactClassifier := Option("classpath"),
     packageJavaClasspathJar / packageOptions := {
       val classpath = (packageJavaClasspathJar / scriptClasspath).value
-      val manifestClasspath = Attributes.Name.CLASS_PATH -> classpath.mkString(" ")
+      val manifestClasspath = PluginCompat.classpathAttr -> classpath.mkString(" ")
       Seq(ManifestAttributes(manifestClasspath))
     },
     packageJavaClasspathJar / artifactName := { (scalaVersion, moduleId, artifact) =>
       moduleId.organization + "." + artifact.name + "-" + moduleId.revision +
         artifact.classifier.fold("")("-" + _) + "." + artifact.extension
     },
-    bashScriptDefines / scriptClasspath := Seq((packageJavaClasspathJar / artifactPath).value.getName),
-    batScriptReplacements / scriptClasspath := Seq((packageJavaClasspathJar / artifactPath).value.getName),
+    bashScriptDefines / scriptClasspath := {
+      Seq(PluginCompat.getArtifactPathName((packageJavaClasspathJar / artifactPath).value))
+    },
+    batScriptReplacements / scriptClasspath := {
+      Seq(PluginCompat.getArtifactPathName((packageJavaClasspathJar / artifactPath).value))
+    },
     Universal / mappings += {
       val classpathJar = packageJavaClasspathJar.value
-      classpathJar -> ("lib/" + classpathJar.getName)
+      classpathJar -> ("lib/" + PluginCompat.getName(classpathJar))
     }
   )
 }
diff --git a/src/main/scala/com/typesafe/sbt/packager/jar/LauncherJarPlugin.scala b/src/main/scala/com/typesafe/sbt/packager/jar/LauncherJarPlugin.scala
index ae32b4471..ceeacd0b2 100644
--- a/src/main/scala/com/typesafe/sbt/packager/jar/LauncherJarPlugin.scala
+++ b/src/main/scala/com/typesafe/sbt/packager/jar/LauncherJarPlugin.scala
@@ -4,17 +4,18 @@ import java.io.File
 import java.util.jar.Attributes
 
 import sbt.Package.ManifestAttributes
-import sbt._
+import sbt.{*, given}
 import sbt.Keys._
+import com.typesafe.sbt.packager.PluginCompat
 import com.typesafe.sbt.packager.Keys._
 import com.typesafe.sbt.SbtNativePackager.Universal
 import com.typesafe.sbt.packager.archetypes.JavaAppPackaging
+import xsbti.FileConverter
 
 object LauncherJarPlugin extends AutoPlugin {
 
   object autoImport {
-    val packageJavaLauncherJar: TaskKey[File] = TaskKey[File](
-      "packageJavaLauncherJar",
+    val packageJavaLauncherJar: TaskKey[PluginCompat.FileRef] = taskKey[PluginCompat.FileRef](
       "Creates a Java launcher jar that specifies the main class and classpath in its manifest"
     )
   }
@@ -29,9 +30,9 @@ object LauncherJarPlugin extends AutoPlugin {
     packageJavaLauncherJar / artifactClassifier := Option("launcher"),
     packageJavaLauncherJar / packageOptions := {
       val classpath = (packageJavaLauncherJar / scriptClasspath).value
-      val manifestClasspath = Attributes.Name.CLASS_PATH -> classpath.mkString(" ")
+      val manifestClasspath = PluginCompat.classpathAttr -> classpath.mkString(" ")
       val manifestMainClass =
-        (Compile / packageJavaLauncherJar / mainClass).value.map(Attributes.Name.MAIN_CLASS -> _)
+        (Compile / packageJavaLauncherJar / mainClass).value.map(PluginCompat.mainclassAttr -> _)
       Seq(ManifestAttributes(manifestMainClass.toSeq :+ manifestClasspath: _*))
     },
     packageJavaLauncherJar / artifactName := { (scalaVersion, moduleId, artifact) =>
@@ -39,16 +40,24 @@ object LauncherJarPlugin extends AutoPlugin {
         artifact.classifier.fold("")("-" + _) + "." + artifact.extension
     },
     Compile / bashScriptDefines / mainClass := {
-      Some(s"""-jar "$$lib_dir/${(packageJavaLauncherJar / artifactPath).value.getName}"""")
+      val conv0 = fileConverter.value
+      implicit val conv: FileConverter = conv0
+      val a = (packageJavaLauncherJar / artifactPath).value
+      Some(s"""-jar "$$lib_dir/${PluginCompat.artifactPathToFile(a).getName}"""")
     },
     bashScriptDefines / scriptClasspath := Nil,
     Compile / batScriptReplacements / mainClass := {
-      Some(s"""-jar "%APP_LIB_DIR%\\${(packageJavaLauncherJar / artifactPath).value.getName}"""")
+      val conv0 = fileConverter.value
+      implicit val conv: FileConverter = conv0
+      val a = (packageJavaLauncherJar / artifactPath).value
+      Some(s"""-jar "%APP_LIB_DIR%\\${PluginCompat.artifactPathToFile(a).getName}"""")
     },
     batScriptReplacements / scriptClasspath := Nil,
     Universal / mappings += {
       val javaLauncher = packageJavaLauncherJar.value
-      javaLauncher -> ("lib/" + javaLauncher.getName)
+      val conv0 = fileConverter.value
+      implicit val conv: FileConverter = conv0
+      javaLauncher -> ("lib/" + PluginCompat.toFile(javaLauncher).getName)
     }
   )
 }
diff --git a/src/main/scala/com/typesafe/sbt/packager/jdkpackager/JDKPackagerAntHelper.scala b/src/main/scala/com/typesafe/sbt/packager/jdkpackager/JDKPackagerAntHelper.scala
index 3a91c263b..aba8b58d6 100644
--- a/src/main/scala/com/typesafe/sbt/packager/jdkpackager/JDKPackagerAntHelper.scala
+++ b/src/main/scala/com/typesafe/sbt/packager/jdkpackager/JDKPackagerAntHelper.scala
@@ -1,12 +1,14 @@
 package com.typesafe.sbt.packager.jdkpackager
 
+import com.typesafe.sbt.packager.PluginCompat
 import com.typesafe.sbt.packager.jdkpackager.JDKPackagerPlugin.autoImport._
 import org.apache.tools.ant.{BuildEvent, BuildListener, ProjectHelper}
-import sbt.Keys._
-import sbt._
+import sbt.Keys.*
+import sbt.{*, given}
 
 import scala.util.Try
 import scala.xml.Elem
+import xsbti.FileConverter
 
 /**
   * Helpers for working with Ant build definitions
@@ -135,10 +137,12 @@ object JDKPackagerAntHelper {
   private[jdkpackager] def deployDOM(
     basename: String,
     packageType: String,
-    mainJar: File,
+    mainJar: PluginCompat.ArtifactPath,
     outputDir: File,
-    infoDOM: InfoDOM
-  ): DeployDOM =
+    infoDOM: InfoDOM,
+    conv0: FileConverter
+  ): DeployDOM = {
+    implicit val conv: FileConverter = conv0
     // format: OFF
     <fx:deploy outdir={outputDir.getAbsolutePath}
                outfile={basename}
@@ -159,9 +163,10 @@ object JDKPackagerAntHelper {
         <fx:fileset refid="data.files"/>
       </fx:resources>
 
-      <fx:bundleArgument arg="mainJar" value={"lib/" + mainJar.getName} />
+      <fx:bundleArgument arg="mainJar" value={"lib/" + PluginCompat.artifactPathToFile(mainJar).getName} />
 
     </fx:deploy>
+  }
   // format: ON
 
   type BuildDOM = xml.Elem
@@ -176,7 +181,7 @@ object JDKPackagerAntHelper {
     antExtraClasspath: Seq[File],
     name: String,
     sourceDir: File,
-    mappings: Seq[(File, String)],
+    mappings: Seq[(PluginCompat.FileRef, String)],
     platformDOM: PlatformDOM,
     applicationDOM: ApplicationDOM,
     deployDOM: DeployDOM
@@ -233,7 +238,7 @@ object JDKPackagerAntHelper {
     val globs =
       Seq("*.dmg", "*.pkg", "*.app", "*.msi", "*.exe", "*.deb", "*.rpm")
     val finder = globs.foldLeft(PathFinder.empty)(_ +++ output ** _)
-    val result = finder.getPaths.headOption
+    val result = finder.getPaths().headOption
     result.foreach(f => s.log.info("Wrote " + f))
     result.map(file)
   }
@@ -248,8 +253,14 @@ object JDKPackagerAntHelper {
   }
 
   /** Build package via Ant build.xml definition. */
-  private[jdkpackager] def buildPackageWithAnt(buildXML: File, target: File, s: TaskStreams): File = {
+  private[jdkpackager] def buildPackageWithAnt(
+    buildXML: File,
+    target: File,
+    conv0: FileConverter,
+    s: TaskStreams
+  ): PluginCompat.FileRef = {
     import org.apache.tools.ant.{Project => AntProject}
+    implicit val conv: FileConverter = conv0
 
     val ap = new AntProject
     ap.setUserProperty("ant.file", buildXML.getAbsolutePath)
@@ -264,7 +275,8 @@ object JDKPackagerAntHelper {
     ap.removeBuildListener(adapter)
 
     // Not sure what to do when we can't find the result
-    findResult(target, s).getOrElse(target)
+    val result = findResult(target, s).getOrElse(target)
+    PluginCompat.toFileRef(result)
   }
 
   /** For piping Ant messages to sbt logger. */
diff --git a/src/main/scala/com/typesafe/sbt/packager/jdkpackager/JDKPackagerPlugin.scala b/src/main/scala/com/typesafe/sbt/packager/jdkpackager/JDKPackagerPlugin.scala
index 635020576..1b2d67c80 100644
--- a/src/main/scala/com/typesafe/sbt/packager/jdkpackager/JDKPackagerPlugin.scala
+++ b/src/main/scala/com/typesafe/sbt/packager/jdkpackager/JDKPackagerPlugin.scala
@@ -1,14 +1,14 @@
 package com.typesafe.sbt.packager.jdkpackager
 
 import com.typesafe.sbt.SbtNativePackager
-import com.typesafe.sbt.packager.Keys._
+import com.typesafe.sbt.packager.Keys.*
 import com.typesafe.sbt.packager.SettingsHelper
 import com.typesafe.sbt.packager.archetypes.JavaAppPackaging
 import com.typesafe.sbt.packager.archetypes.jar.LauncherJarPlugin
-import sbt.Keys._
-import sbt._
+import sbt.Keys.*
+import sbt.{*, given}
 import SbtNativePackager.Universal
-import JDKPackagerAntHelper._
+import JDKPackagerAntHelper.*
 
 /**
   * Package format via Oracle's packaging tool bundled with JDK 8.
@@ -74,11 +74,12 @@ object JDKPackagerPlugin extends AutoPlugin {
             maintainer.value,
             jdkAppIcon.value,
             jdkPackagerAssociations.value
-          )
+          ),
+          fileConverter.value
         )
       ),
       writeAntBuild := writeAntFile(target.value, antBuildDefn.value, streams.value),
-      packageBin := buildPackageWithAnt(writeAntBuild.value, target.value, streams.value)
+      packageBin := buildPackageWithAnt(writeAntBuild.value, target.value, fileConverter.value, streams.value)
     )
   )
 
diff --git a/src/main/scala/com/typesafe/sbt/packager/linux/Keys.scala b/src/main/scala/com/typesafe/sbt/packager/linux/Keys.scala
index d58ad8fa6..cd5cc8720 100644
--- a/src/main/scala/com/typesafe/sbt/packager/linux/Keys.scala
+++ b/src/main/scala/com/typesafe/sbt/packager/linux/Keys.scala
@@ -2,7 +2,7 @@ package com.typesafe.sbt
 package packager
 package linux
 
-import sbt._
+import sbt.{*, given}
 import com.typesafe.sbt.packager.archetypes.systemloader.ServerLoader
 
 /** Linux packaging generic build targets. */
@@ -34,7 +34,7 @@ trait LinuxKeys {
   val generateManPages = TaskKey[Unit]("generate-man-pages", "Shows all the man files in the current project")
 
   val linuxMakeStartScript =
-    TaskKey[Option[File]]("linuxMakeStartScript", "Creates or discovers the start script used by this project")
+    taskKey[Option[File]]("Creates or discovers the start script used by this project")
   val linuxStartScriptTemplate = TaskKey[URL](
     "linuxStartScriptTemplate",
     "The location of the template start script file we use for debian (upstart or init.d"
@@ -67,7 +67,8 @@ trait LinuxKeys {
       """.stripMargin
   )
 
-  val makeEtcDefault = TaskKey[Option[File]]("makeEtcDefault", "Creates or discovers the /etc/default/ script")
+  val makeEtcDefault =
+    taskKey[Option[File]]("Creates or discovers the /etc/default/ script")
 
   val defaultLinuxInstallLocation =
     SettingKey[String]("defaultLinuxInstallLocation", "The location where we will install generic linux packages.")
diff --git a/src/main/scala/com/typesafe/sbt/packager/linux/LinuxMappingDSL.scala b/src/main/scala/com/typesafe/sbt/packager/linux/LinuxMappingDSL.scala
index 5754dabe2..e2d0b9adc 100644
--- a/src/main/scala/com/typesafe/sbt/packager/linux/LinuxMappingDSL.scala
+++ b/src/main/scala/com/typesafe/sbt/packager/linux/LinuxMappingDSL.scala
@@ -1,6 +1,6 @@
 package com.typesafe.sbt.packager.linux
 
-import sbt._
+import sbt.{*, given}
 
 trait LinuxMappingDSL {
 
@@ -13,7 +13,7 @@ trait LinuxMappingDSL {
     * @param files
     */
   def packageTemplateMapping(files: String*)(dir: File = new File(sys.props("java.io.tmpdir"))) =
-    LinuxPackageMapping(files map ((dir, _)))
+    LinuxPackageMapping(files.map((dir, _)))
 
   // TODO can the packager.MappingsHelper be used here?
   /**
@@ -34,7 +34,7 @@ trait LinuxMappingDSL {
   def mapDirectoryAndContents(dirs: (File, String)*): Seq[(File, String)] =
     for {
       (src, dest) <- dirs
-      path <- (src ** AllPassFilter).get
+      path <- (src ** AllPassFilter).get()
     } yield path -> path.toString.replaceFirst(src.toString, dest)
 
   /**
diff --git a/src/main/scala/com/typesafe/sbt/packager/linux/LinuxPackageMapping.scala b/src/main/scala/com/typesafe/sbt/packager/linux/LinuxPackageMapping.scala
index 4f66e0545..5e1fe1d55 100644
--- a/src/main/scala/com/typesafe/sbt/packager/linux/LinuxPackageMapping.scala
+++ b/src/main/scala/com/typesafe/sbt/packager/linux/LinuxPackageMapping.scala
@@ -2,7 +2,7 @@ package com.typesafe.sbt
 package packager
 package linux
 
-import sbt._
+import sbt.{*, given}
 import LinuxPlugin.Users
 
 case class LinuxFileMetaData(
@@ -32,7 +32,7 @@ case class LinuxPackageMapping(
   def withConfig(c: String = "true") = copy(fileData = fileData withConfig c)
   def withContents() =
     copy(mappings = Mapper.mapDirectoryAndContents(mappings.toSeq: _*))
-  def asDocs() = copy(fileData = fileData asDocs ())
+  def asDocs() = copy(fileData = fileData.asDocs())
 
   /** Modifies the current package mapping to have gzipped data. */
   def gzipped = copy(zipped = true)
diff --git a/src/main/scala/com/typesafe/sbt/packager/linux/LinuxPlugin.scala b/src/main/scala/com/typesafe/sbt/packager/linux/LinuxPlugin.scala
index 44a5d4d3e..3bfe9b4a6 100644
--- a/src/main/scala/com/typesafe/sbt/packager/linux/LinuxPlugin.scala
+++ b/src/main/scala/com/typesafe/sbt/packager/linux/LinuxPlugin.scala
@@ -1,12 +1,13 @@
-package com.typesafe.sbt.packager.linux
+package com.typesafe.sbt.packager
+package linux
 
-import sbt._
-import sbt.Keys.{mappings, name, sourceDirectory, streams}
+import sbt.{*, given}
+import sbt.Keys.{fileConverter, mappings, name, sourceDirectory, streams}
 import com.typesafe.sbt.SbtNativePackager.Universal
-import com.typesafe.sbt.packager.MappingsHelper
-import com.typesafe.sbt.packager.Keys._
+import com.typesafe.sbt.packager.Keys.*
 import com.typesafe.sbt.packager.universal.UniversalPlugin
 import com.typesafe.sbt.packager.archetypes.TemplateWriter
+import xsbti.FileConverter
 
 /**
   * Plugin containing all the generic values used for packaging linux software.
@@ -50,7 +51,7 @@ object LinuxPlugin extends AutoPlugin {
       Linux / sourceDirectory := sourceDirectory.value / "linux",
       generateManPages := {
         val log = streams.value.log
-        for (file <- ((Linux / sourceDirectory).value / "usr/share/man/man1" ** "*.1").get) {
+        for (file <- ((Linux / sourceDirectory).value / "usr/share/man/man1" ** "*.1").get()) {
           val man = makeMan(file)
           log.info("Generated man page for[" + file + "] =")
           log.info(man)
@@ -116,27 +117,32 @@ object LinuxPlugin extends AutoPlugin {
       linuxPackageMappings ++= getUniversalFolderMappings(
         (Linux / packageName).value,
         defaultLinuxInstallLocation.value,
-        (Universal / mappings).value
+        (Universal / mappings).value,
+        fileConverter.value
       ),
       // Now we generate symlinks.
       linuxPackageSymlinks ++= {
+        val conv0 = fileConverter.value
+        implicit val conv: FileConverter = conv0
         val installLocation = defaultLinuxInstallLocation.value
         val linuxPackageName = (Linux / packageName).value
         for {
           (file, name) <- (Universal / mappings).value
-          if !file.isDirectory
+          if !PluginCompat.toFile(file).isDirectory
           if name startsWith "bin/"
           if !(name endsWith ".bat") // IGNORE windows-y things.
         } yield LinuxSymlink("/usr/" + name, installLocation + "/" + linuxPackageName + "/" + name)
       },
       // Map configuration files
       linuxPackageSymlinks ++= {
+        val conv0 = fileConverter.value
+        implicit val conv: FileConverter = conv0
         val linuxPackageName = (Linux / packageName).value
         val installLocation = defaultLinuxInstallLocation.value
         val configLocation = defaultLinuxConfigLocation.value
         val needsConfLink =
           (Universal / mappings).value exists { case (file, destination) =>
-            (destination startsWith "conf/") && !file.isDirectory
+            (destination startsWith "conf/") && !PluginCompat.toFile(file).isDirectory
           }
         if (needsConfLink)
           Seq(
@@ -189,7 +195,7 @@ object LinuxPlugin extends AutoPlugin {
     *   placeholder->content
     */
   def controlScriptFunctionsReplacement(template: Option[URL] = None): (String, String) = {
-    val url = template getOrElse LinuxPlugin.controlFunctions
+    val url = template getOrElse LinuxPlugin.controlFunctions()
     LinuxPlugin.CONTROL_FUNCTIONS -> TemplateWriter.generateScript(source = url, replacements = Nil)
   }
 
@@ -240,7 +246,7 @@ object LinuxPlugin extends AutoPlugin {
     Seq(
       packageMappingWithRename(binaries ++ directories: _*) withUser user withGroup group withPerms "0755",
       packageMappingWithRename(compressedManPages: _*).gzipped withUser user withGroup group withPerms "0644",
-      packageMappingWithRename(configFiles: _*) withConfig () withUser user withGroup group withPerms "0644",
+      packageMappingWithRename(configFiles: _*).withConfig() withUser user withGroup group withPerms "0644",
       packageMappingWithRename(remaining: _*) withUser user withGroup group withPerms "0644"
     )
   }
@@ -251,13 +257,17 @@ object LinuxPlugin extends AutoPlugin {
   private[this] def getUniversalFolderMappings(
     pkg: String,
     installLocation: String,
-    mappings: Seq[(File, String)]
+    mappings: Seq[(PluginCompat.FileRef, String)],
+    conv0: FileConverter
   ): Seq[LinuxPackageMapping] = {
+    implicit val conv: FileConverter = conv0
     // TODO - More windows filters...
-    def isWindowsFile(f: (File, String)): Boolean =
+    def isWindowsFile(f: (PluginCompat.FileRef, String)): Boolean =
       f._2 endsWith ".bat"
 
-    val filtered = mappings.filterNot(isWindowsFile)
+    val filtered = mappings.filterNot(isWindowsFile).map { case (x, p) =>
+      (PluginCompat.toFile(x), p)
+    }
 
     if (filtered.isEmpty) Seq.empty
     else
diff --git a/src/main/scala/com/typesafe/sbt/packager/rpm/RpmHelper.scala b/src/main/scala/com/typesafe/sbt/packager/rpm/RpmHelper.scala
index 00e58e599..2de76b24b 100644
--- a/src/main/scala/com/typesafe/sbt/packager/rpm/RpmHelper.scala
+++ b/src/main/scala/com/typesafe/sbt/packager/rpm/RpmHelper.scala
@@ -1,14 +1,16 @@
 package com.typesafe.sbt.packager.rpm
 
-import sbt._
+import sbt.{*, given}
+import com.typesafe.sbt.packager.PluginCompat
 import com.typesafe.sbt.packager.linux.LinuxSymlink
 import com.typesafe.sbt.packager.sourceDateEpoch
+import xsbti.FileConverter
 
 object RpmHelper {
 
   /** Returns the host vendor for an rpm. */
   def hostVendor =
-    sys.process.Process(Seq("rpm", "-E", "%{_host_vendor}")) !!
+    sys.process.Process(Seq("rpm", "-E", "%{_host_vendor}")).!!
 
   /**
     * Prepares the staging directory for the rpm build command.
@@ -22,7 +24,7 @@ object RpmHelper {
     * @return
     *   the `workArea`
     */
-  def stage(spec: RpmSpec, workArea: File, log: sbt.Logger): File = {
+  def stage(spec: RpmSpec, workArea: File, log: sbt.Logger)(implicit conv: FileConverter): File = {
     buildWorkArea(workArea)
     copyFiles(spec, workArea, log)
     writeSpecFile(spec, workArea, log)
@@ -31,8 +33,12 @@ object RpmHelper {
     workArea
   }
 
-  private[rpm] def defaultRpmArtifactPath(stagingArea: File, meta: RpmMetadata): File =
-    stagingArea / "RPMS" / meta.arch / s"${meta.name}-${meta.version}-${meta.release}.${meta.arch}.rpm"
+  private[rpm] def defaultRpmArtifactPath(stagingArea: File, meta: RpmMetadata)(implicit
+    conv: FileConverter
+  ): PluginCompat.ArtifactPath =
+    PluginCompat.toArtifactPath(
+      stagingArea / "RPMS" / meta.arch / s"${meta.name}-${meta.version}-${meta.release}.${meta.arch}.rpm"
+    )
 
   /**
     * Build the rpm package
@@ -46,12 +52,14 @@ object RpmHelper {
     * @return
     *   The rpm package
     */
-  def buildRpm(spec: RpmSpec, stagingArea: File, log: sbt.Logger): File = {
+  def buildRpm(spec: RpmSpec, stagingArea: File, log: sbt.Logger)(implicit
+    conv: FileConverter
+  ): PluginCompat.ArtifactPath = {
     buildPackage(stagingArea, spec, log)
     defaultRpmArtifactPath(stagingArea, spec.meta)
   }
 
-  private[this] def copyFiles(spec: RpmSpec, workArea: File, log: sbt.Logger): Unit = {
+  private[this] def copyFiles(spec: RpmSpec, workArea: File, log: sbt.Logger)(implicit conv: FileConverter): Unit = {
     // TODO - special treatment of icon...
     val buildroot = workArea / "tmp-buildroot"
 
@@ -80,7 +88,9 @@ object RpmHelper {
     LinuxSymlink.makeSymLinks(spec.symlinks, buildroot, relativeLinks = false)
   }
 
-  private[this] def writeSpecFile(spec: RpmSpec, workArea: File, log: sbt.Logger): File = {
+  private[this] def writeSpecFile(spec: RpmSpec, workArea: File, log: sbt.Logger)(implicit
+    conv: FileConverter
+  ): File = {
     val specdir = workArea / "SPECS"
     val rpmBuildroot = workArea / "buildroot"
     val tmpBuildRoot = workArea / "tmp-buildroot"
diff --git a/src/main/scala/com/typesafe/sbt/packager/rpm/RpmMetadata.scala b/src/main/scala/com/typesafe/sbt/packager/rpm/RpmMetadata.scala
index 169f11214..daa0909e8 100644
--- a/src/main/scala/com/typesafe/sbt/packager/rpm/RpmMetadata.scala
+++ b/src/main/scala/com/typesafe/sbt/packager/rpm/RpmMetadata.scala
@@ -7,6 +7,8 @@ import com.typesafe.sbt.packager.linux.{LinuxFileMetaData, LinuxPackageMapping,
 import com.typesafe.sbt.packager.rpm.RpmPlugin.Names._
 import com.typesafe.sbt.packager.archetypes.TemplateWriter
 import java.io.File
+import java.nio.file.Files
+import xsbti.FileConverter
 
 case class RpmMetadata(
   name: String,
@@ -198,14 +200,14 @@ case class RpmSpec(
     sb.toString
   }
 
-  private[this] def fileSection: String = {
+  private[this] def fileSection(implicit conv: FileConverter): String = {
     val sb = new StringBuilder
     sb append "\n%files\n"
     // TODO - default attribute string.
     for {
       mapping <- mappings
       (file, dest) <- mapping.mappings
-    } sb append makeFilesLine(dest, mapping.fileData, file.isDirectory)
+    } sb.append(makeFilesLine(dest, mapping.fileData, file.isDirectory))
 
     symlinks foreach (l => sb append s"${l.link}\n")
     sb.toString
@@ -229,7 +231,7 @@ case class RpmSpec(
   }
 
   // TODO - This is *very* tied to RPM helper, may belong *in* RpmHelper
-  def writeSpec(rpmRoot: File, tmpRoot: File): String = {
+  def writeSpec(rpmRoot: File, tmpRoot: File)(implicit conv: FileConverter): String = {
     val sb = new StringBuilder
     sb append ("Name: %s\n" format meta.name)
     sb append ("Version: %s\n" format meta.version)
diff --git a/src/main/scala/com/typesafe/sbt/packager/rpm/RpmPlugin.scala b/src/main/scala/com/typesafe/sbt/packager/rpm/RpmPlugin.scala
index ea23a39c9..557bcb2de 100644
--- a/src/main/scala/com/typesafe/sbt/packager/rpm/RpmPlugin.scala
+++ b/src/main/scala/com/typesafe/sbt/packager/rpm/RpmPlugin.scala
@@ -1,15 +1,17 @@
 package com.typesafe.sbt.packager.rpm
 
-import sbt._
-import sbt.Keys._
+import sbt.{*, given}
+import sbt.Keys.*
 import java.nio.charset.Charset
 
 import com.typesafe.sbt.SbtNativePackager.Linux
+import com.typesafe.sbt.packager.PluginCompat
 import com.typesafe.sbt.packager.SettingsHelper
-import com.typesafe.sbt.packager.Keys._
-import com.typesafe.sbt.packager.linux._
-import com.typesafe.sbt.packager.Compat._
-import com.typesafe.sbt.packager.validation._
+import com.typesafe.sbt.packager.Keys.*
+import com.typesafe.sbt.packager.linux.*
+import com.typesafe.sbt.packager.Compat.*
+import com.typesafe.sbt.packager.validation.*
+import xsbti.FileConverter
 
 /**
   * Plugin containing all generic values used for packaging rpms.
@@ -104,12 +106,16 @@ object RpmPlugin extends AutoPlugin {
     Rpm / executableScriptName := (Linux / executableScriptName).value,
     rpmDaemonLogFile := s"${(Linux / packageName).value}.log",
     Rpm / daemonStdoutLogFile := Some(rpmDaemonLogFile.value),
-    Rpm / validatePackageValidators := Seq(
-      nonEmptyMappings((Rpm / linuxPackageMappings).value.flatMap(_.mappings)),
-      filesExist((Rpm / linuxPackageMappings).value.flatMap(_.mappings)),
-      checkMaintainer((Rpm / maintainer).value, asWarning = false),
-      epochIsNaturalNumber((Rpm / rpmEpoch).value.getOrElse(0))
-    ),
+    Rpm / validatePackageValidators := {
+      val conv0 = fileConverter.value
+      implicit val conv: FileConverter = conv0
+      Seq(
+        nonEmptyMappings((Rpm / linuxPackageMappings).value.flatMap(_.mappings)),
+        filesExist((Rpm / linuxPackageMappings).value.flatMap(_.mappings)),
+        checkMaintainer((Rpm / maintainer).value, asWarning = false),
+        epochIsNaturalNumber((Rpm / rpmEpoch).value.getOrElse(0))
+      )
+    },
     // override the linux sourceDirectory setting
     Rpm / sourceDirectory := sourceDirectory.value,
     Rpm / packageArchitecture := "noarch",
@@ -164,18 +170,35 @@ object RpmPlugin extends AutoPlugin {
       (Rpm / linuxPackageSymlinks).value,
       (Rpm / defaultLinuxInstallLocation).value
     ),
-    Rpm / stage := RpmHelper.stage(rpmSpecConfig.value, (Rpm / target).value, streams.value.log),
-    Rpm / packageBin / artifactPath := RpmHelper.defaultRpmArtifactPath((Rpm / target).value, rpmMetadata.value),
+    Rpm / stage := {
+      val conv0 = fileConverter.value
+      implicit val conv: FileConverter = conv0
+      RpmHelper.stage(rpmSpecConfig.value, (Rpm / target).value, streams.value.log)
+    },
+    Rpm / packageBin / artifactPath := {
+      val conv0 = fileConverter.value
+      implicit val conv: FileConverter = conv0
+      RpmHelper.defaultRpmArtifactPath((Rpm / target).value, rpmMetadata.value)
+    },
     Rpm / packageBin := {
+      val conv0 = fileConverter.value
+      implicit val conv: FileConverter = conv0
       val defaultPath = RpmHelper.buildRpm(rpmSpecConfig.value, (Rpm / stage).value, streams.value.log)
       // `file` points to where buildRpm created the rpm. However we want it to be at `artifactPath`.
       // If `artifactPath` is not the default value then we need to copy the file.
       val path = (Rpm / packageBin / artifactPath).value
-      if (path.getCanonicalFile != defaultPath.getCanonicalFile) IO.copyFile(defaultPath, path)
-      path
+      val defaultPathFile = PluginCompat.artifactPathToFile(defaultPath)
+      val pathFile = PluginCompat.artifactPathToFile(path)
+      if (pathFile.getCanonicalFile != defaultPathFile.getCanonicalFile)
+        IO.copyFile(defaultPathFile, pathFile)
+      PluginCompat.toFileRef(pathFile)
     },
     rpmLint := {
-      sys.process.Process(Seq("rpmlint", "-v", (Rpm / packageBin).value.getAbsolutePath)) ! streams.value.log match {
+      val conv0 = fileConverter.value
+      implicit val conv: FileConverter = conv0
+      val pkg = (Rpm / packageBin).value
+      val path = PluginCompat.toNioPath(pkg)
+      sys.process.Process(Seq("rpmlint", "-v", path.toAbsolutePath().toString())).!(streams.value.log) match {
         case 0 => ()
         case x => sys.error("Failed to run rpmlint, exit status: " + x)
       }
diff --git a/src/main/scala/com/typesafe/sbt/packager/universal/Keys.scala b/src/main/scala/com/typesafe/sbt/packager/universal/Keys.scala
index 8c2e91f79..521563600 100644
--- a/src/main/scala/com/typesafe/sbt/packager/universal/Keys.scala
+++ b/src/main/scala/com/typesafe/sbt/packager/universal/Keys.scala
@@ -6,15 +6,16 @@ import sbt._
 
 trait UniversalKeys {
   val packageZipTarball =
-    TaskKey[File]("package-zip-tarball", "Creates a tgz package.")
+    taskKey[PluginCompat.FileRef]("Creates a tgz package.")
   val packageXzTarball =
-    TaskKey[File]("package-xz-tarball", "Creates a txz package.")
-  val packageOsxDmg = TaskKey[File]("package-osx-dmg", "Creates a dmg package for macOS (only on macOS).")
+    taskKey[PluginCompat.FileRef]("Creates a txz package.")
+  val packageOsxDmg =
+    taskKey[PluginCompat.FileRef]("Creates a dmg package for macOS (only on macOS).")
   val stage = TaskKey[File](
     "stage",
     "Create a local directory with all the files laid out as they would be in the final distribution."
   )
-  val dist = TaskKey[File]("dist", "Creates the distribution packages.")
+  val dist = taskKey[PluginCompat.FileRef]("Creates the distribution packages.")
   val stagingDirectory = SettingKey[File]("stagingDirectory", "Directory where we stage distributions/releases.")
   val topLevelDirectory = SettingKey[Option[String]]("topLevelDirectory", "Top level dir in compressed output file.")
   val universalArchiveOptions =
diff --git a/src/main/scala/com/typesafe/sbt/packager/universal/UniversalPlugin.scala b/src/main/scala/com/typesafe/sbt/packager/universal/UniversalPlugin.scala
index 502e40091..7542c45db 100644
--- a/src/main/scala/com/typesafe/sbt/packager/universal/UniversalPlugin.scala
+++ b/src/main/scala/com/typesafe/sbt/packager/universal/UniversalPlugin.scala
@@ -1,14 +1,16 @@
-package com.typesafe.sbt.packager.universal
+package com.typesafe.sbt.packager
+package universal
 
-import sbt._
-import sbt.Keys._
-import Archives._
+import sbt.{*, given}
+import sbt.Keys.*
+import Archives.*
 import com.typesafe.sbt.SbtNativePackager
-import com.typesafe.sbt.packager.Keys._
+import com.typesafe.sbt.packager.Keys.*
 import com.typesafe.sbt.packager.docker.DockerPlugin
 import com.typesafe.sbt.packager.validation._
 import com.typesafe.sbt.packager.{SettingsHelper, Stager}
 import sbt.Keys.TaskStreams
+import xsbti.FileConverter
 
 /**
   * ==Universal Plugin==
@@ -84,10 +86,14 @@ object UniversalPlugin extends AutoPlugin {
       inConfig(config)(
         Seq(
           packageName := (packageName.value + "-" + version.value),
-          mappings := findSources(sourceDirectory.value),
+          mappings := findSources(sourceDirectory.value, fileConverter.value),
           dist := printDist(packageBin.value, streams.value),
           stagingDirectory := target.value / "stage",
-          stage := Stager.stage(config.name)(streams.value, stagingDirectory.value, mappings.value)
+          stage := {
+            val conv0 = fileConverter.value
+            implicit val conv: FileConverter = conv0
+            Stager.stage(config.name)(streams.value, stagingDirectory.value, mappings.value)
+          }
         )
       ) ++ Seq(
         config / sourceDirectory := sourceDirectory.value / config.name,
@@ -105,35 +111,49 @@ object UniversalPlugin extends AutoPlugin {
       UniversalSrc / packageXzTarball / universalArchiveOptions := Seq("-pcvf")
     )
 
-  private[this] def printDist(dist: File, streams: TaskStreams): File = {
+  private[this] def printDist(dist: PluginCompat.FileRef, streams: TaskStreams): PluginCompat.FileRef = {
     streams.log.info("")
-    streams.log.info("Your package is ready in " + dist.getCanonicalPath)
+    streams.log.info("Your package is ready in " + dist.toString())
     streams.log.info("")
     dist
   }
 
-  private type Packager = (File, String, Seq[(File, String)], Option[String], Seq[String]) => File
+  private type Packager =
+    (File, String, Seq[(File, String)], Option[String], Seq[String]) => File
 
   /** Creates packaging settings for a given package key, configuration + archive type. */
-  private[this] def makePackageSettings(packageKey: TaskKey[File], config: Configuration)(
+  private[this] def makePackageSettings(packageKey: TaskKey[PluginCompat.FileRef], config: Configuration)(
     packager: Packager
   ): Seq[Setting[_]] =
     inConfig(config)(
       Seq(
         packageKey / universalArchiveOptions := Nil,
         packageKey / mappings := mappings.value,
-        packageKey := packager(
-          target.value,
-          packageName.value,
-          (packageKey / mappings).value,
-          topLevelDirectory.value,
-          (packageKey / universalArchiveOptions).value
-        ),
-        packageKey / validatePackageValidators := (config / validatePackageValidators).value ++ Seq(
-          nonEmptyMappings((packageKey / mappings).value),
-          filesExist((packageKey / mappings).value),
-          checkMaintainer((packageKey / maintainer).value, asWarning = true)
-        ),
+        packageKey := {
+          val conv0 = fileConverter.value
+          implicit val conv: FileConverter = conv0
+          val xs = (packageKey / mappings).value
+          val fileMappings = xs.map { case (ref, p) => PluginCompat.toFile(ref) -> p }
+          val file = packager(
+            target.value,
+            packageName.value,
+            fileMappings,
+            topLevelDirectory.value,
+            (packageKey / universalArchiveOptions).value
+          )
+          PluginCompat.toFileRef(file)
+        },
+        packageKey / validatePackageValidators := {
+          val conv0 = fileConverter.value
+          implicit val conv: FileConverter = conv0
+          val xs = (packageKey / mappings).value
+          val fileMappings = xs.map { case (ref, p) => PluginCompat.toFile(ref) -> p }
+          (config / validatePackageValidators).value ++ Seq(
+            nonEmptyMappings(fileMappings),
+            filesExist(fileMappings),
+            checkMaintainer((packageKey / maintainer).value, asWarning = true)
+          )
+        },
         packageKey / validatePackage := Validation
           .runAndThrow((config / packageKey / validatePackageValidators).value, streams.value.log),
         packageKey := packageKey.dependsOn(packageKey / validatePackage).value
@@ -141,8 +161,12 @@ object UniversalPlugin extends AutoPlugin {
     )
 
   /** Finds all sources in a source directory. */
-  private[this] def findSources(sourceDir: File): Seq[(File, String)] =
-    ((PathFinder(sourceDir) ** AllPassFilter) --- sourceDir).pair(file => IO.relativize(sourceDir, file))
+  private[this] def findSources(sourceDir: File, conv0: FileConverter): Seq[(PluginCompat.FileRef, String)] = {
+    implicit val conv: FileConverter = conv0
+    ((PathFinder(sourceDir) ** AllPassFilter) --- sourceDir).pair(file => IO.relativize(sourceDir, file)).map {
+      case (f, p) => PluginCompat.toFileRef(f) -> p
+    }
+  }
 
 }
 
diff --git a/src/main/scala/com/typesafe/sbt/packager/validation/package.scala b/src/main/scala/com/typesafe/sbt/packager/validation/package.scala
index c770d402f..dcddff676 100644
--- a/src/main/scala/com/typesafe/sbt/packager/validation/package.scala
+++ b/src/main/scala/com/typesafe/sbt/packager/validation/package.scala
@@ -1,6 +1,6 @@
 package com.typesafe.sbt.packager
 
-import sbt._
+import sbt.{*, given}
 
 /**
   * ==validation==
@@ -42,7 +42,7 @@ package object validation {
         }
         .map { case (file, dest) =>
           ValidationError(
-            description = s"Not found: ${file.getAbsolutePath} (mapped to $dest)",
+            description = s"Not found: ${file} (mapped to $dest)",
             howToFix = "Generate the file in the task/setting that adds it to the mappings task"
           )
         }
diff --git a/src/main/scala/com/typesafe/sbt/packager/windows/WindowsPlugin.scala b/src/main/scala/com/typesafe/sbt/packager/windows/WindowsPlugin.scala
index e310e0744..3d021ee14 100644
--- a/src/main/scala/com/typesafe/sbt/packager/windows/WindowsPlugin.scala
+++ b/src/main/scala/com/typesafe/sbt/packager/windows/WindowsPlugin.scala
@@ -1,14 +1,16 @@
 package com.typesafe.sbt.packager.windows
 
-import sbt._
-import sbt.Keys.{mappings, name, packageBin, sourceDirectory, streams, target, version}
+import sbt.{*, given}
+import sbt.Keys.{fileConverter, mappings, name, packageBin, sourceDirectory, streams, target, version}
 import com.typesafe.sbt.SbtNativePackager.Universal
 import com.typesafe.sbt.packager.Keys.{maintainer, packageDescription, packageName, packageSummary}
 import com.typesafe.sbt.packager.universal.UniversalPlugin
-import com.typesafe.sbt.packager.Compat._
+import com.typesafe.sbt.packager.Compat.*
+import com.typesafe.sbt.packager.PluginCompat
 import com.typesafe.sbt.packager.SettingsHelper
 
 import com.typesafe.sbt.packager.sourceDateEpoch
+import xsbti.FileConverter
 
 /**
   * ==Windows Plugin==
@@ -96,6 +98,8 @@ object WindowsPlugin extends AutoPlugin {
       },
       wixFiles := Seq(wixFile.value)
     ) ++ inConfig(Windows)(Seq(packageBin := {
+      val conv0 = fileConverter.value
+      implicit val conv: FileConverter = conv0
       val wsxSources = wixFiles.value
       val msi = target.value / (name.value + ".msi")
 
@@ -107,7 +111,7 @@ object WindowsPlugin extends AutoPlugin {
         src.getAbsolutePath != dest.getAbsolutePath
       }
       IO.copy(wsxCopyPairs)
-      IO.copy(for ((f, to) <- mappings.value) yield (f, target.value / to))
+      IO.copy(for ((f, to) <- mappings.value) yield (PluginCompat.toFile(f), target.value / to))
 
       // Now compile WIX
       val candleCmd = findWixExecutable("candle") +:
@@ -137,7 +141,7 @@ object WindowsPlugin extends AutoPlugin {
         case 0        => ()
         case exitCode => sys.error(s"Unable to run build msi. Exited with ${exitCode}")
       }
-      msi
+      PluginCompat.toFileRef(msi)
     }))
 
   /**
@@ -146,7 +150,11 @@ object WindowsPlugin extends AutoPlugin {
   def mapGenericFilesToWindows: Seq[Setting[_]] =
     Seq(
       Windows / mappings := (Universal / mappings).value,
-      wixFeatures := makeWindowsFeatures((Windows / packageName).value, (Windows / mappings).value)
+      wixFeatures := {
+        val conv0 = fileConverter.value
+        implicit val conv: FileConverter = conv0
+        makeWindowsFeatures((Windows / packageName).value, (Windows / mappings).value)
+      }
     )
 
   /**
@@ -159,12 +167,15 @@ object WindowsPlugin extends AutoPlugin {
     * @return
     *   windows features
     */
-  def makeWindowsFeatures(name: String, mappings: Seq[(File, String)]): Seq[WindowsFeature] = {
+  def makeWindowsFeatures(name: String, mappings: Seq[(PluginCompat.FileRef, String)])(implicit
+    conv: FileConverter
+  ): Seq[WindowsFeature] = {
     // TODO select main script!  Filter Config links!
 
     val files =
       for {
-        (file, name) <- mappings
+        (ref, name) <- mappings
+        file = PluginCompat.toFile(ref)
         if !file.isDirectory
       } yield ComponentFile(name, editable = name startsWith "conf")
     val corePackage =
@@ -185,7 +196,8 @@ object WindowsPlugin extends AutoPlugin {
         components = Seq(AddDirectoryToPath("bin"))
       )
     val configLinks = for {
-      (file, name) <- mappings
+      (ref, name) <- mappings
+      file = PluginCompat.toFile(ref)
       if !file.isDirectory
       if name startsWith "conf/"
     } yield name.replaceAll("//", "/").stripSuffix("/").stripSuffix("/")
diff --git a/src/main/scala/com/typesafe/sbt/packager/windows/WixHelper.scala b/src/main/scala/com/typesafe/sbt/packager/windows/WixHelper.scala
index 6af48ad9f..15d67a933 100644
--- a/src/main/scala/com/typesafe/sbt/packager/windows/WixHelper.scala
+++ b/src/main/scala/com/typesafe/sbt/packager/windows/WixHelper.scala
@@ -6,6 +6,7 @@ import Keys._
 import sbt._
 
 import collection.mutable.ArrayBuffer
+import scala.annotation.nowarn
 import scala.collection.mutable
 
 case class WindowsProductInfo(
@@ -81,6 +82,7 @@ object WixHelper {
     // so there was a gap and dirXml failed to create some directories
     def allParentDirs(f: File): Seq[File] =
       Option(f).toSeq.flatMap(f => f +: allParentDirs(f.getParentFile))
+    @nowarn
     val filenamesPrep =
       for {
         f <- features
@@ -322,7 +324,7 @@ object WixHelper {
   // reference: https://github.com/sbt/sbt-native-packager/issues/726
   def generateComponentsAndDirectoryXml(dir: File, id_prefix: String = ""): (Seq[String], scala.xml.Node) = {
     def makeId(f: File) =
-      cleanStringForId(IO.relativize(dir, f) map (id_prefix +) getOrElse (id_prefix + f.getName))
+      cleanStringForId(IO.relativize(dir, f).map(id_prefix + _).getOrElse(id_prefix + f.getName))
     def handleFile(f: File): (Seq[String], scala.xml.Node) = {
       val id = makeId(f)
       val xml = (
diff --git a/src/sbt-test/ash/add-app-settings/build.sbt b/src/sbt-test/ash/add-app-settings/build.sbt
index 02421431c..400280e17 100644
--- a/src/sbt-test/ash/add-app-settings/build.sbt
+++ b/src/sbt-test/ash/add-app-settings/build.sbt
@@ -1,5 +1,7 @@
 enablePlugins(JavaAppPackaging, AshScriptPlugin)
 
+scalaVersion := "2.12.20"
+
 name := "simple-app"
 
 version := "0.1.0"
diff --git a/src/sbt-test/ash/command-line-settings/build.sbt b/src/sbt-test/ash/command-line-settings/build.sbt
index 234409f2c..175da3420 100644
--- a/src/sbt-test/ash/command-line-settings/build.sbt
+++ b/src/sbt-test/ash/command-line-settings/build.sbt
@@ -1,5 +1,7 @@
 enablePlugins(JavaAppPackaging, AshScriptPlugin)
 
+scalaVersion := "2.12.20"
+
 name := "command-line-app"
 
 version := "0.1.0-SNAPSHOT"
diff --git a/src/sbt-test/ash/memory-settings/build.sbt b/src/sbt-test/ash/memory-settings/build.sbt
index 48a3e128a..59d389df2 100644
--- a/src/sbt-test/ash/memory-settings/build.sbt
+++ b/src/sbt-test/ash/memory-settings/build.sbt
@@ -1,5 +1,7 @@
 enablePlugins(JavaAppPackaging, AshScriptPlugin)
 
+scalaVersion := "2.12.20"
+
 name := "simple-app"
 
 version := "0.1.0"
diff --git a/src/sbt-test/ash/override-templates/build.sbt b/src/sbt-test/ash/override-templates/build.sbt
index 51c1766cc..10b85158a 100644
--- a/src/sbt-test/ash/override-templates/build.sbt
+++ b/src/sbt-test/ash/override-templates/build.sbt
@@ -1,5 +1,7 @@
 import scala.io.Source
 
+scalaVersion := "2.12.20"
+
 enablePlugins(AshScriptPlugin)
 
 name := "override-templates"
diff --git a/src/sbt-test/ash/simple-app/build.sbt b/src/sbt-test/ash/simple-app/build.sbt
index 7343071d1..9d9c5526e 100644
--- a/src/sbt-test/ash/simple-app/build.sbt
+++ b/src/sbt-test/ash/simple-app/build.sbt
@@ -1,5 +1,7 @@
 import com.typesafe.sbt.packager.Compat._
 
+scalaVersion := "2.12.20"
+
 enablePlugins(AshScriptPlugin)
 
 name := "simple-app"
diff --git a/src/sbt-test/ash/top-level-main/build.sbt b/src/sbt-test/ash/top-level-main/build.sbt
index 0633728fc..e306ed32d 100644
--- a/src/sbt-test/ash/top-level-main/build.sbt
+++ b/src/sbt-test/ash/top-level-main/build.sbt
@@ -1,5 +1,7 @@
 import com.typesafe.sbt.packager.Compat._
 
+scalaVersion := "2.12.20"
+
 enablePlugins(AshScriptPlugin)
 
 name := "top-level-main"
diff --git a/src/sbt-test/bash/absolute-path-in-bash/build.sbt b/src/sbt-test/bash/absolute-path-in-bash/build.sbt
index b1453e8bb..0225e35cb 100644
--- a/src/sbt-test/bash/absolute-path-in-bash/build.sbt
+++ b/src/sbt-test/bash/absolute-path-in-bash/build.sbt
@@ -1,3 +1,5 @@
+scalaVersion := "2.12.20"
+
 enablePlugins(JavaAppPackaging)
 
 name := "absolute-path-in-bash"
diff --git a/src/sbt-test/bash/java-home-var-expansion/build.sbt b/src/sbt-test/bash/java-home-var-expansion/build.sbt
index d106ba650..dfa1d4db2 100644
--- a/src/sbt-test/bash/java-home-var-expansion/build.sbt
+++ b/src/sbt-test/bash/java-home-var-expansion/build.sbt
@@ -1,5 +1,7 @@
 import com.typesafe.sbt.packager.Compat._
 
+scalaVersion := "2.12.20"
+
 enablePlugins(JavaAppPackaging)
 
 name := "java-home-override"
diff --git a/src/sbt-test/bash/memory-settings/build.sbt b/src/sbt-test/bash/memory-settings/build.sbt
index e64f3b293..3ceb242e0 100644
--- a/src/sbt-test/bash/memory-settings/build.sbt
+++ b/src/sbt-test/bash/memory-settings/build.sbt
@@ -1,5 +1,7 @@
 import com.typesafe.sbt.packager.Compat._
 
+scalaVersion := "2.12.20"
+
 enablePlugins(JavaAppPackaging)
 
 name := "simple-app"
diff --git a/src/sbt-test/bash/multiple-apps/build.sbt b/src/sbt-test/bash/multiple-apps/build.sbt
index a1aabee2b..8f27558a7 100644
--- a/src/sbt-test/bash/multiple-apps/build.sbt
+++ b/src/sbt-test/bash/multiple-apps/build.sbt
@@ -1,5 +1,7 @@
 import com.typesafe.sbt.packager.Compat._
 
+scalaVersion := "2.12.20"
+
 enablePlugins(JavaAppPackaging)
 
 name := "test-project"
diff --git a/src/sbt-test/bash/override-templates/build.sbt b/src/sbt-test/bash/override-templates/build.sbt
index f14372d74..257d11f02 100644
--- a/src/sbt-test/bash/override-templates/build.sbt
+++ b/src/sbt-test/bash/override-templates/build.sbt
@@ -1,5 +1,7 @@
 import scala.io.Source
 
+scalaVersion := "2.12.20"
+
 enablePlugins(JavaAppPackaging)
 
 name := "override-templates"
diff --git a/src/sbt-test/bash/simple-app/build.sbt b/src/sbt-test/bash/simple-app/build.sbt
index 43064cda4..acf534a17 100644
--- a/src/sbt-test/bash/simple-app/build.sbt
+++ b/src/sbt-test/bash/simple-app/build.sbt
@@ -1,5 +1,7 @@
 import com.typesafe.sbt.packager.Compat._
 
+scalaVersion := "2.12.20"
+
 enablePlugins(JavaAppPackaging)
 
 name := "simple-app"
diff --git a/src/sbt-test/bash/top-level-main/build.sbt b/src/sbt-test/bash/top-level-main/build.sbt
index 9e823aeae..49630ce1f 100644
--- a/src/sbt-test/bash/top-level-main/build.sbt
+++ b/src/sbt-test/bash/top-level-main/build.sbt
@@ -1,5 +1,7 @@
 import com.typesafe.sbt.packager.Compat._
 
+scalaVersion := "2.12.20"
+
 enablePlugins(JavaAppPackaging)
 
 name := "top-level-main"
diff --git a/src/sbt-test/universal/absolute-path/build.sbt b/src/sbt-test/universal/absolute-path/build.sbt
index 988fe7f4c..1467c395d 100644
--- a/src/sbt-test/universal/absolute-path/build.sbt
+++ b/src/sbt-test/universal/absolute-path/build.sbt
@@ -1,3 +1,5 @@
+scalaVersion := "2.12.20"
+
 enablePlugins(JavaAppPackaging)
 
 name := "absolute-path"
diff --git a/src/sbt-test/universal/application-ini-from-javaoptions/build.sbt b/src/sbt-test/universal/application-ini-from-javaoptions/build.sbt
index 00964eab6..1b65d4576 100644
--- a/src/sbt-test/universal/application-ini-from-javaoptions/build.sbt
+++ b/src/sbt-test/universal/application-ini-from-javaoptions/build.sbt
@@ -1,3 +1,5 @@
+scalaVersion := "2.12.20"
+
 enablePlugins(JavaServerAppPackaging)
 
 name := "simple-test"
diff --git a/src/sbt-test/universal/clear-stage-dir/build.sbt b/src/sbt-test/universal/clear-stage-dir/build.sbt
index 3615d803a..30aca88ac 100644
--- a/src/sbt-test/universal/clear-stage-dir/build.sbt
+++ b/src/sbt-test/universal/clear-stage-dir/build.sbt
@@ -1,3 +1,5 @@
+scalaVersion := "2.12.20"
+
 enablePlugins(UniversalPlugin)
 
 name := "simple-test"
diff --git a/src/sbt-test/universal/dist/build.sbt b/src/sbt-test/universal/dist/build.sbt
index 3615d803a..30aca88ac 100644
--- a/src/sbt-test/universal/dist/build.sbt
+++ b/src/sbt-test/universal/dist/build.sbt
@@ -1,3 +1,5 @@
+scalaVersion := "2.12.20"
+
 enablePlugins(UniversalPlugin)
 
 name := "simple-test"
diff --git a/src/sbt-test/universal/multiproject-classifiers/build.sbt b/src/sbt-test/universal/multiproject-classifiers/build.sbt
index 6b99f2fd6..969991f40 100644
--- a/src/sbt-test/universal/multiproject-classifiers/build.sbt
+++ b/src/sbt-test/universal/multiproject-classifiers/build.sbt
@@ -1,5 +1,7 @@
 import com.typesafe.sbt.packager.Compat._
 
+ThisBuild / scalaVersion := "2.12.20"
+
 lazy val appVersion = "1.0"
 
 lazy val mySettings: Seq[Setting[_]] =
diff --git a/src/sbt-test/universal/publish/build.sbt b/src/sbt-test/universal/publish/build.sbt
index 0fca7bbd1..484c42014 100644
--- a/src/sbt-test/universal/publish/build.sbt
+++ b/src/sbt-test/universal/publish/build.sbt
@@ -1,3 +1,5 @@
+scalaVersion := "2.12.20"
+
 enablePlugins(UniversalDeployPlugin)
 
 name := "simple-test"
diff --git a/src/sbt-test/universal/staging-custom-main/build.sbt b/src/sbt-test/universal/staging-custom-main/build.sbt
index f9d5789f3..c7524fec6 100644
--- a/src/sbt-test/universal/staging-custom-main/build.sbt
+++ b/src/sbt-test/universal/staging-custom-main/build.sbt
@@ -6,6 +6,8 @@ name := "stage-custom-main"
 
 version := "0.1.0"
 
+scalaVersion := "2.12.20"
+
 Compile / mainClass := Some("Main")
 
 TaskKey[Unit]("unzip") := {
diff --git a/src/sbt-test/universal/staging/build.sbt b/src/sbt-test/universal/staging/build.sbt
index 3615d803a..30aca88ac 100644
--- a/src/sbt-test/universal/staging/build.sbt
+++ b/src/sbt-test/universal/staging/build.sbt
@@ -1,3 +1,5 @@
+scalaVersion := "2.12.20"
+
 enablePlugins(UniversalPlugin)
 
 name := "simple-test"
diff --git a/src/sbt-test/universal/test-executableScriptName/build.sbt b/src/sbt-test/universal/test-executableScriptName/build.sbt
index 300822822..4613bca67 100644
--- a/src/sbt-test/universal/test-executableScriptName/build.sbt
+++ b/src/sbt-test/universal/test-executableScriptName/build.sbt
@@ -1,5 +1,7 @@
 import com.typesafe.sbt.packager.Compat._
 
+scalaVersion := "2.12.20"
+
 enablePlugins(JavaAppPackaging)
 
 name := "simple-test"
diff --git a/src/sbt-test/universal/test-mapping-helpers/build.sbt b/src/sbt-test/universal/test-mapping-helpers/build.sbt
index b21cf0613..08c0e6f40 100644
--- a/src/sbt-test/universal/test-mapping-helpers/build.sbt
+++ b/src/sbt-test/universal/test-mapping-helpers/build.sbt
@@ -2,6 +2,8 @@ import com.typesafe.sbt.packager.Compat._
 
 import com.typesafe.sbt.packager.MappingsHelper._
 
+scalaVersion := "2.12.20"
+
 enablePlugins(JavaAppPackaging)
 
 name := "simple-test"
diff --git a/src/sbt-test/universal/test-native-zip/build.sbt b/src/sbt-test/universal/test-native-zip/build.sbt
index 95cbe0949..567f326ce 100644
--- a/src/sbt-test/universal/test-native-zip/build.sbt
+++ b/src/sbt-test/universal/test-native-zip/build.sbt
@@ -1,3 +1,5 @@
+scalaVersion := "2.12.20"
+
 enablePlugins(JavaAppPackaging)
 
 name := "simple-test"
diff --git a/src/sbt-test/universal/test-packageName/build.sbt b/src/sbt-test/universal/test-packageName/build.sbt
index a94707bcf..d5789cb51 100644
--- a/src/sbt-test/universal/test-packageName/build.sbt
+++ b/src/sbt-test/universal/test-packageName/build.sbt
@@ -1,3 +1,5 @@
+scalaVersion := "2.12.20"
+
 enablePlugins(JavaAppPackaging)
 
 name := "simple-test"
diff --git a/src/sbt-test/universal/test-zips-no-top-level-dir/build.sbt b/src/sbt-test/universal/test-zips-no-top-level-dir/build.sbt
index 45d9353e9..839579509 100644
--- a/src/sbt-test/universal/test-zips-no-top-level-dir/build.sbt
+++ b/src/sbt-test/universal/test-zips-no-top-level-dir/build.sbt
@@ -1,3 +1,5 @@
+scalaVersion := "2.12.20"
+
 enablePlugins(JavaAppPackaging)
 
 name := "simple-test"
diff --git a/src/sbt-test/universal/test-zips/build.sbt b/src/sbt-test/universal/test-zips/build.sbt
index de62e9544..0bb488202 100644
--- a/src/sbt-test/universal/test-zips/build.sbt
+++ b/src/sbt-test/universal/test-zips/build.sbt
@@ -1,3 +1,5 @@
+scalaVersion := "2.12.20"
+
 enablePlugins(JavaAppPackaging)
 
 name := "simple-test"
diff --git a/src/sbt-test/universal/validation/build.sbt b/src/sbt-test/universal/validation/build.sbt
index 3615d803a..30aca88ac 100644
--- a/src/sbt-test/universal/validation/build.sbt
+++ b/src/sbt-test/universal/validation/build.sbt
@@ -1,3 +1,5 @@
+scalaVersion := "2.12.20"
+
 enablePlugins(UniversalPlugin)
 
 name := "simple-test"
diff --git a/src/sbt-test/windows/absolute-path-in-bat/build.sbt b/src/sbt-test/windows/absolute-path-in-bat/build.sbt
index b70ed2804..8a6ac2b73 100644
--- a/src/sbt-test/windows/absolute-path-in-bat/build.sbt
+++ b/src/sbt-test/windows/absolute-path-in-bat/build.sbt
@@ -1,3 +1,5 @@
+scalaVersion := "2.12.20"
+
 enablePlugins(JavaAppPackaging)
 
 name := "absolute-path-in-bat"
diff --git a/src/sbt-test/windows/app-home-var-expansion/build.sbt b/src/sbt-test/windows/app-home-var-expansion/build.sbt
index 2faa4e1c9..bb2293e35 100644
--- a/src/sbt-test/windows/app-home-var-expansion/build.sbt
+++ b/src/sbt-test/windows/app-home-var-expansion/build.sbt
@@ -1,5 +1,7 @@
 import com.typesafe.sbt.packager.Compat._
 
+scalaVersion := "2.12.20"
+
 enablePlugins(JavaAppPackaging)
 
 name := "simple-app"
diff --git a/src/sbt-test/windows/custom-wix/build.sbt b/src/sbt-test/windows/custom-wix/build.sbt
index 3fb8fb142..1157efb0b 100644
--- a/src/sbt-test/windows/custom-wix/build.sbt
+++ b/src/sbt-test/windows/custom-wix/build.sbt
@@ -1,3 +1,5 @@
+scalaVersion := "2.12.20"
+
 enablePlugins(WindowsPlugin)
 
 name := "custom-wix"
diff --git a/src/sbt-test/windows/dynamic-app-env-name/build.sbt b/src/sbt-test/windows/dynamic-app-env-name/build.sbt
index 7f1bc09cd..917b88603 100644
--- a/src/sbt-test/windows/dynamic-app-env-name/build.sbt
+++ b/src/sbt-test/windows/dynamic-app-env-name/build.sbt
@@ -1,5 +1,7 @@
 import com.typesafe.sbt.packager.Compat._
 
+scalaVersion := "2.12.20"
+
 enablePlugins(JavaAppPackaging)
 
 name := "example-cli"
diff --git a/src/sbt-test/windows/java-app-archetype/build.sbt b/src/sbt-test/windows/java-app-archetype/build.sbt
index 0b60a8bdf..b93055ce4 100644
--- a/src/sbt-test/windows/java-app-archetype/build.sbt
+++ b/src/sbt-test/windows/java-app-archetype/build.sbt
@@ -1,5 +1,7 @@
 import com.typesafe.sbt.packager.Compat._
 
+scalaVersion := "2.12.20"
+
 enablePlugins(JavaAppPackaging)
 
 name := "windows-test"
diff --git a/src/sbt-test/windows/memory-settings/build.sbt b/src/sbt-test/windows/memory-settings/build.sbt
index 2dc61280a..a7a2a2b82 100644
--- a/src/sbt-test/windows/memory-settings/build.sbt
+++ b/src/sbt-test/windows/memory-settings/build.sbt
@@ -1,5 +1,7 @@
 import com.typesafe.sbt.packager.Compat._
 
+scalaVersion := "2.12.20"
+
 enablePlugins(JavaAppPackaging)
 
 name := "simple-app"
diff --git a/src/sbt-test/windows/multiple-apps/build.sbt b/src/sbt-test/windows/multiple-apps/build.sbt
index a1967fd8b..47e1d61a0 100644
--- a/src/sbt-test/windows/multiple-apps/build.sbt
+++ b/src/sbt-test/windows/multiple-apps/build.sbt
@@ -1,5 +1,7 @@
 import com.typesafe.sbt.packager.Compat._
 
+scalaVersion := "2.12.20"
+
 enablePlugins(JavaAppPackaging)
 
 name := "test-project"
diff --git a/src/sbt-test/windows/test-bat-template/build.sbt b/src/sbt-test/windows/test-bat-template/build.sbt
index 0e6948333..d249b91ad 100644
--- a/src/sbt-test/windows/test-bat-template/build.sbt
+++ b/src/sbt-test/windows/test-bat-template/build.sbt
@@ -1,5 +1,7 @@
 import com.typesafe.sbt.packager.Compat._
 
+scalaVersion := "2.12.20"
+
 enablePlugins(JavaAppPackaging)
 
 name := "windows-test"
diff --git a/src/sbt-test/windows/test-custom-main/build.sbt b/src/sbt-test/windows/test-custom-main/build.sbt
index 63c31d49f..69be5228c 100644
--- a/src/sbt-test/windows/test-custom-main/build.sbt
+++ b/src/sbt-test/windows/test-custom-main/build.sbt
@@ -1,5 +1,7 @@
 import com.typesafe.sbt.packager.Compat._
 
+scalaVersion := "2.12.20"
+
 enablePlugins(JavaAppPackaging)
 
 name := "test-custom-main"
diff --git a/src/test/scala/com/typesafe/sbt/packager/universal/ZipHelperSpec.scala b/src/test/scala/com/typesafe/sbt/packager/universal/ZipHelperSpec.scala
index eb2c9b80a..979ed21b5 100644
--- a/src/test/scala/com/typesafe/sbt/packager/universal/ZipHelperSpec.scala
+++ b/src/test/scala/com/typesafe/sbt/packager/universal/ZipHelperSpec.scala
@@ -6,7 +6,7 @@ import org.scalatest._
 import java.io.File
 import java.nio.file.{Files, Path, Paths}
 import java.nio.file.attribute.PosixFilePermission._
-import scala.collection.JavaConversions._
+import scala.collection.JavaConverters._
 import org.scalatest.matchers.should.Matchers
 import org.scalatest.wordspec.AnyWordSpec
 
@@ -15,12 +15,12 @@ class ZipHelperSpec extends AnyWordSpec with Matchers with BeforeAndAfterEach wi
   var tmp: Path = _
   val toDelete = scala.collection.mutable.ListBuffer[Path]()
 
-  override def beforeEach: Unit = {
+  override def beforeEach(): Unit = {
     tmp = Files createTempDirectory "_sbt-native-packager"
     toDelete += tmp
   }
 
-  override def afterAll: Unit =
+  override def afterAll(): Unit =
     toDelete foreach { dir =>
       scala.util.Try {
         Files.walkFileTree(dir, new DeleteDirectoryVisitor)