Hmm I'm kind of surprised browsers actually load WAV data with that mangled header. Audio 'quirks' mode? Just because something could work without the header doesn't mean it should (or at least not advertised as a standard format). I wonder if there are fuzzing opportunities in that part of the browser code..
There are only two things wrong with the header: the RIFF chunk size is invalid, and the data chunk size is invalid.
That song sounds so familiar... ;)
I love this tune. Let's make a multiplayer game out of it :D