For the past week certain Excel files have been displaying that message. I’m not in the file, and haven’t been all morning. I even re-boot and it still says it. I’ve had to re-name the damned file before I can use it.
It could be that it didn’t get closed out properly once. Try serching your temp files and deleting all the ones with those funny letter and number names and see if that helps.
If the file is on a different file server & not on your PC then rebooting won’t help. You’ll have to remove the lock on the file server itself. I can’t tell you how - I have my local NT admin handle that for me.
Bingo. If your file is on a server it could be locked by you. Also, it gets the locking info from the registration info that was used when Office was installed. If you put that info into another computer, it could be that PC that is locking the file.