gen_snapshot:

runtime/bin/vmservice/loader.dart

 // Copyright (c) 2015, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 part of vmservice_io;
 
 _sanitizeWindowsPath(path) {
   // For Windows we need to massage the paths a bit according to
   // http://blogs.msdn.com/b/ie/archive/2006/12/06/file-uris-in-windows.aspx
   //
@@ skipping 1102 matching lines @@
         default:
           if (traceLoading) {
             _log('Unknown scheme (${pathUri.scheme}) in $pathUri.');
           }
           _sendExtensionImportResponse(sp, uri, libraryUri, null);
         break;
       }
     break;
     case _Dart_kResolveAsFilePath:
       String uri = request[4];
-      Uri resolvedUri = Uri.parse(uri);
+      Uri resolvedUri = Uri.parse(_sanitizeWindowsPath(uri));
       try {
         if (resolvedUri.scheme == 'package') {
           resolvedUri = loaderState._resolvePackageUri(resolvedUri);
         }
         if (resolvedUri.scheme == '' || resolvedUri.scheme == 'file') {
           resolvedUri = loaderState._workingDirectory.resolveUri(resolvedUri);
           var msg = new List(5);
           msg[0] = tag;
           msg[1] = uri;
           msg[2] = resolvedUri.toString();
@@ skipping 11 matching lines @@
         msg[2] = resolvedUri.toString();
         msg[3] = null;
         msg[4] = e.toString();
         sp.send(msg);
       }
     break;
     default:
       _log('Unknown loader request tag=$tag from $isolateId');
   }
 }