The system is XP Pro SP2. I've been told that a folder can be made to appear empty (in Windows Explorer) by having a desktop.ini file containing:

CLSID={645FF040-5081-101B-9F08-00AA002F954E}

I've not seen this in action nor have I been able to reproduce it on my laptop, whether I have the line [.ShellClassInfo] before the CLSID line or not. Does anyone know anything about this? The files in the folder can still be seen via DOS commands but are invisible in Windows Explorer whether the hidden files are set to be seen or not.