[-pWn-DeadCell]

Listen up, the pak file that contains all of the sound waves is pak3. Thumper, is you have been in this folder and have only found the expolosion files, your problem is either: the files literally arent there, and you need to re-install or somehow, you've managed to turn all the sounds into hidden files, theoretically this would explain if you could still play the game and all of the sounds work fine.

My advice, just re-install it will save yourself alot of greef in the long run...