File Open By...?

Hi all, I'm trying to create VB code which will tell me what user on an NT 4 domain currently has a particular file open.

Can someone point me to or show me an example?

File Manager (Winfile) in NT 4 allows you to see who has a file open by first clicking on File => Properties for a particular file, then clicking an "Open By" button which shows who has a file open and in what mode (Read, Write).

Thanks in advance for any help!