It looks to be OK at first glance. You may want to add a try/except clause around the os.remove() call so that it can fail gracefully, though. An exception will be raised on Windows if the file in question happens to be open. Better safe than sorry.
Also ... I'm sure there's probably more "allowable" unmanifested files that will only become apparent
after you've released your plugin (not that I can think of any offhand). A way for the user to exempt specific files (or file-types) might stave off future trouble.
