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Steam I think my copy of the game is so old that it wont work with steam :S ??? Because everytime I try to register it with steam it says that my cd key is invalid, and without steam in the normal version with the mod, I can see all the new skins, but some of the guns make no sound when they shoot.

oh and also I have the non-steam version of the game,

Hey, just today I thought i would go back and play some Opposing Force when i noticed there was a mod for it... the mod is brilliant and i have extracted everything to the right place, but for some of the reasons the modified guns make no sound? even the knife is soundless! can anybody i help...