Replacing the Music

[Thexare]

So I was looking into replacing the Freelancer music with something a little more lively so I'm less likely to fall asleep during quiet trade runs, and I found the .wav files (Program Files/Microsoft Games/Freelancer/DATA/AUDIO/MUSIC), but I ran into a problem. Specifically, Winamp seems to be unable to play them, leaving me unable to determine exactly where each is used. I mean, in some cases it's obvious because of the filename, but...

Anyway, has anyone else had that issue? Anyone else tried replacing the music, and if so, are there any potential obstacles to deal with if I simply grab an MP3-WAV converter and get to work on the replacements?