Hi - I'm trying to do the same thing with SSX3. I have got the files extracted from the music.big and music2.big files, and they come out as name.mpf and name.mus. The .mus seems to be the actual audio, as they range from 15-30.
Also, i was looking in the MOVIES folder and all the files in there have the extension .mpc. I open it up with notepad and i see a line "Encoded with MPEG Gimex module" in it. Cant find anything about gimex on the web either... I'm all into doing this now and its pissing me off i cant do it
I have searched high and low for information on both the music and movies but havent been able to find anything... hopefully someone knows these files inside and out here.