Converting audio in Xbox 360 video (WMV) files?

I’m trying to convert some of these babies from their native format to something that I can use in other media players, and Windows Media Player can play them, but I’m not finding anything that can actually convert the audio to WAV. Has this problem already been solved (as I suspect it has)? Could some fine individual be so kind as to show me the method/tools needed to do so?

Have you tried toWav (http://tinyurl.com/yfy33q8)? Though I think it requires a ton of hex-editing. I only managed to rip Project Sylpheed’s music using this tool so results aren’t guaranteed.

I gave toWav a shot, but it didn’t work. I think they utilize some weird form of WMA or something, but I’ll be damned if I can figure it out.