I convert the .cmd to 64bit exe then it is able to list the Virtual Folders and Files.
start notepad.exe ".\lib\test.txt" is still not working but then I realize notepad.exe is a "outside process" which cannot view the Virtual files.

I think I know the way now.
Thanks for the prompt reply and all ...

I am unable to access boxed files with batch files, may I know if I have done anything wrong? I have checked all the 3 options in Options. Attached the source for testing, tools.exe is converted from tools.cmd with "Bat to Exe Converter", it simply launch notepad.exe and open lib\test.txt file ...