Testing the File System Virtualization
You can test the Filesystem virtualization outside VirtualUI (the virtualization service must be running, though). In order to test the Filesystem virtualization, choose the 'File' - 'Test' option from the main menu. This will bring up the 'Launch Application' dialog:
After selecting a user and a program to test, press the 'Launch' button. When you access the Windows file system through this application, you should only be seeing the mapped directories, by their original names.