Any windows command to find if a file is in use or not ?

[npocmaka_]

This should list handled files : http://technet.microsoft.com/bg-bg/sysi ... 96655.aspx
There's also a property in WIN32_Process class that shows handels but is not used in WMIC utility.
It will be easy to create a vbs/jscript that reads that property and iterates the processes (may be I'll try)