won't delete
 

Hi everyone! Whenever I try to delete a certain file, it won't let me. It says, 'Unable to delete the file. May be in use by another application.' I tried running a search for the file and it didn't come up with anything. I don't know what else to do! Any ideas?

Is anything else using the file? Such as an open folder, or anything else?

I don't think so. How would I check for that?