There is a app called Ripper (I can't remember where I foud it at) that can rip almost anything from almost any file.
The file "Sound.rez" is where all the music, sfx, and voices are.... They are wav files, but I think they are compressed like MP3's do to their high quailty. Very impressive.
But most of them are in small sections of music.
For instance, the main menu screen music isn't just one .wav file, but several. I think they used this method for performance sake.
Just search the net for "ripper" or "ripper 2000" or something like that... it's freeware.
There is a DOS version I use to use to rip midi from Doom and Doom II wad files...
Keep in mind that it doesn't work on everything, but it does help you hack some files... pretty cool..