I have a user with an Excel file on a shared network drive and the file cannot be deleted. The error we get is "action cannot be completed because the file is open in another program". It has been nearly two weeks since this problem started and they have given up and did a save-as to have a new working copy. I have removed all user permissions to the file, so that now the user(s) who were accessing the file cannot even see or use it. Now I just want to delete the file but cannot. Shy of rebooting the file server (a Windows Server 2008 machine), how else can I possibly remove whatever lock is currently on the file?