Yeah, and how would they expect to control media players other than WiMP? The OS has no way of knowing if what is playing on your speakers is coming from a file, if it's randomly generated, if it's based off of inputs like a mic, if it's a sound effect from a game, WHAT file it's from if it is from the file... it's the programs that take care of these details and the sound drivers do not care.
[Edit: Slashdot is cool. They haven't said anything like this. There might have been something about TPM some months ago, but that's totally different.]
Both XP and Vista (supposedly) defrag NTFS drives while the computer is idle. I've personally never seen a drive map while this happens on either OS... and I'm glad.
That doesn't make sense to me. Try a different media player or tweak some settings in the one you're using. If you can hear stuff (well, MIDIs/MODs/etc might use something different than full audio like MP3s and WAVs) then there's no reason why WAVs shouldn't play.
Right click EXE, Properties, Compativility, run in XPSP2 mode.