diff --git a/guest/guest.go b/guest/guest.go
deleted file mode 100644
index bccf463..0000000
--- a/guest/guest.go
+++ /dev/null
@@ -1,65 +0,0 @@
-package guest
-
-import (
-	"context"
-	"crypto/rand"
-	"io"
-	"os"
-
-	"github.com/ipfs/boxo/files"
-	"github.com/ipfs/boxo/path"
-	iface "github.com/ipfs/kubo/core/coreiface"
-	"github.com/tetratelabs/wazero"
-	"github.com/tetratelabs/wazero/api"
-)
-
-type Config struct {
-	IPFS iface.CoreAPI
-	Root path.Path
-	Sys  interface {
-		Stdin() io.Reader
-	}
-}
-
-// Compile and instantiate the guest module from the namespace path.
-// Note that CompiledModule is produced in an intermediate step, and
-// that it is not closed until r is closed.
-func (c Config) Instanatiate(ctx context.Context, r wazero.Runtime) (api.Module, error) {
-	cm, err := c.CompileModule(ctx, r)
-	if err != nil {
-		return nil, err
-	}
-
-	return r.InstantiateModule(ctx, cm, wazero.NewModuleConfig().
-		// WithName().
-		// WithArgs().
-		// WithEnv().
-		WithRandSource(rand.Reader).
-		WithFS(FS{IPFS: c.IPFS}).
-		// WithFSConfig().
-		// WithStartFunctions(). // remove _start so that we can call it later
-		WithStdin(c.Sys.Stdin()).
-		WithStdout(os.Stdout). // FIXME
-		WithStderr(os.Stderr). // FIXME
-		WithSysNanotime())
-}
-
-func (c Config) CompileModule(ctx context.Context, r wazero.Runtime) (wazero.CompiledModule, error) {
-	bytecode, err := c.LoadByteCode(ctx)
-	if err != nil {
-		return nil, err
-	}
-
-	return r.CompileModule(ctx, bytecode)
-}
-
-func (c Config) LoadByteCode(ctx context.Context) ([]byte, error) {
-	n, err := c.IPFS.Unixfs().Get(ctx, c.Root)
-	if err != nil {
-		return nil, err
-	}
-	defer n.Close()
-
-	// FIXME:  address the obvious DoS vector
-	return io.ReadAll(n.(files.File))
-}
diff --git a/guest/fs.go b/system/fs.go
similarity index 85%
rename from guest/fs.go
rename to system/fs.go
index 94a0598..6226b06 100644
--- a/guest/fs.go
+++ b/system/fs.go
@@ -1,10 +1,11 @@
-package guest
+package system
 
 import (
 	"context"
 	"io/fs"
 
 	"github.com/ipfs/boxo/files"
+	"github.com/ipfs/boxo/path"
 	iface "github.com/ipfs/kubo/core/coreiface"
 	"github.com/pkg/errors"
 )
@@ -20,7 +21,8 @@ var _ fs.FS = (*FS)(nil)
 // [testing/fstest.TestFS] may be used to test implementations of an FS for
 // correctness.
 type FS struct {
-	IPFS iface.CoreAPI
+	API  iface.UnixfsAPI
+	Path path.Path
 }
 
 // Open opens the named file.
@@ -33,20 +35,24 @@ type FS struct {
 // fs.ValidPath(name), returning a *fs.PathError with Err set to
 // fs.ErrInvalid or fs.ErrNotExist.
 func (f FS) Open(name string) (fs.File, error) {
-	if !fs.ValidPath(name) {
+	p, err := path.Join(f.Path, name)
+	if err != nil {
 		return nil, &fs.PathError{
-			Op:   "FS.Open",
+			Op:   "path.Join",
 			Path: name,
-			Err:  errors.New("invalid path"),
+			Err:  err,
 		}
 	}
 
-	path, err := f.IPFS.Name().Resolve(context.TODO(), name)
-	if err != nil {
-		return nil, err
+	if !fs.ValidPath(p.String()) {
+		return nil, &fs.PathError{
+			Op:   "fs.ValidPath",
+			Path: name,
+			Err:  errors.New("invalid path"),
+		}
 	}
 
-	node, err := f.IPFS.Unixfs().Get(context.TODO(), path)
+	node, err := f.API.Get(context.TODO(), p)
 	if err != nil {
 		return nil, err
 	}
diff --git a/guest/fs_test.go b/system/fs_test.go
similarity index 63%
rename from guest/fs_test.go
rename to system/fs_test.go
index 915eb27..da78a41 100644
--- a/guest/fs_test.go
+++ b/system/fs_test.go
@@ -1,16 +1,16 @@
-package guest_test
+package system_test
 
 import (
 	"testing"
 	"testing/fstest"
 
 	"github.com/stretchr/testify/require"
-	"github.com/wetware/go/guest"
+	"github.com/wetware/go/system"
 )
 
 func TestFS(t *testing.T) {
 	t.Parallel()
 
-	err := fstest.TestFS(guest.FS{})
+	err := fstest.TestFS(system.FS{})
 	require.NoError(t, err)
 }
diff --git a/ww.go b/ww.go
index 651be34..34397a0 100644
--- a/ww.go
+++ b/ww.go
@@ -17,7 +17,7 @@ import (
 	"github.com/tetratelabs/wazero"
 	"github.com/tetratelabs/wazero/imports/wasi_snapshot_preview1"
 	"github.com/thejerf/suture/v4"
-	"github.com/wetware/go/guest"
+	"github.com/wetware/go/system"
 )
 
 const Proto = "/ww/0.0.0"
@@ -103,7 +103,7 @@ func (c Cluster) Serve(ctx context.Context) error {
 			// WithSysWalltime().
 			// WithWalltime().
 			WithStartFunctions().
-			WithFS(guest.FS{IPFS: c.IPFS}).
+			WithFS(system.FS{API: c.IPFS.Unixfs()}).
 			WithRandSource(rand.Reader).
 			WithStdin(os.Stdin).
 			WithStderr(os.Stderr).