fix: Never use file uris

Author: CGNonofr

src/languages/textMate/index.ts

@@ -11,7 +11,10 @@ function createGrammarFactory (): CGTMGrammarFactory {
   const parsedGrammars = (rawGrammars as unknown as Omit<monaco.extra.ITMSyntaxExtensionPoint, 'path'>[])
     .map(grammar => ({
       ...monaco.extra.parseTextMateGrammar(grammar as monaco.extra.ITMSyntaxExtensionPoint, languageService),
-      location: monaco.Uri.file(grammar.scopeName + '.json')
+      location: monaco.Uri.from({
+        scheme: 'browser',
+        path: grammar.scopeName + '.json'
+      })
     }))
 
   return new CGTMGrammarFactory(

src/theme/registry.ts

@@ -54,7 +54,11 @@ export async function defineVSCodeTheme (
   extensionData?: Partial<monaco.extra.ExtensionData>
 ): Promise<void> {
   const path = `/theme-${id}.json`
-  const rootUri = monaco.Uri.file(themeExtensionPoint?.path?.slice(1) ?? path)
+  // Do not use `file` scheme or monaco will replace `/` by `\` on windows
+  const rootUri = monaco.Uri.from({
+    scheme: 'browser',
+    path: themeExtensionPoint?.path?.slice(1) ?? path
+  })
   const themeData = monaco.extra.ColorThemeData.fromExtensionTheme({
     id,
     path: path,