I successfully extracted the .wud, then the *.pak files. Now i don't know which is the extension of the music files, i have these:
.anim (animation)
.caud
.char (characters?)
.cmdl
.csmp
.dcln
.fsmc
.genp
.msbt
.mtrl
.room (room object)
.skel (skelmeshes)
.smdl
.txtr (textures)
.wmdl
.arc (archive)
.mp4 (movies)
.uinf
.ldta
.cabh
.dgrp
.anim (animation)
.caud
.char (characters?)
.cmdl
.csmp
.dcln
.fsmc
.genp
.msbt
.mtrl
.room (room object)
.skel (skelmeshes)
.smdl
.txtr (textures)
.wmdl
.arc (archive)
.mp4 (movies)
.uinf
.ldta
.cabh
.dgrp