Rename. Again, and again.
Have you in this condition? You applied your report, with a hope it will be received by your lecturer or your boss. Then, the nightmare came. It needed revision, for many times. And like the other people, you renamed the file, ups nope, you ADDED the name, became filename.new, then filename.new2, then filename.new2.1 and so on.
Feel desperate, ugh?^_^