Check who's using a file

[Luis]

Hello.
I have a routine that checks if a group of files are being
used by other users in write mode.
Is it possible to get the Microsoft Excel Username, or the
network login of that user?

 

[Tom Ogilvy]

Open the file readonly and check the WriteReservedBy property.

I have heard some say this doesn't work, but it worked for me in light
testing.