fix(react-file-type-icons): Map onepart extension to onenote icon (#33318)

Author: cpalaparthi

change/@fluentui-react-file-type-icons-d220b09a-74bc-4c36-a2b2-764d95a1ac82.json

@@ -0,0 +1,7 @@
+{
+  "type": "patch",
+  "comment": "fix(react-file-type-icons): Map onepart extension to onenote icon",
+  "packageName": "@fluentui/react-file-type-icons",
+  "email": "[email protected]",
+  "dependentChangeType": "patch"
+}

packages/react-file-type-icons/src/FileTypeIconMap.ts

@@ -355,7 +355,7 @@ export const FileTypeIconMap: { [key: string]: { extensions?: string[] } } = {
   multiple: {},
   one: {
     // This is a partial OneNote page or section export. Not whole notebooks, see "onetoc"
-    extensions: ['one'],
+    extensions: ['one', 'onepart'],
   },
   onetoc: {
     // This is an entire OneNote notebook.