WMA sounds - Format?

[BattleSkarz]

I'm making a mod with a friend where he does all the sound effects by voice. So far it's been going pretty well, we've got a "bleeping" sniper, a stuttering smg, a "shazaam"ing grenade, and a "douche"ing and "cock"ing shotgun, but we want to change the announcer and the ambient noise and stuff. However, those sounds are in .wma format, as opposed to the special .wav format everything else is in. We've been using Windows Sound Recorder for .wav, but how can we record .wma files that will work in Halo?

[BattleSkarz]

oops, wrong forum.