Just when jou think you've got everything covered, something unexpected pops up. Someone is linking to one of the sounds (this one) in a forum, so my server is serving this file to everyone who browses this thread. This file has become the most wanted file in just one-and-a-half hour, it has been requested over 500 times. I stopped this hotlinking by adding the wav-extension to the hotlinking-prevention-script.