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Never mind,
turns out you have to unlock em'.
Post edited November 02, 2014 by lazycade
Hope this helps:
http://www.gog.com/forum/aliens_versus_predator_classic_2000/how_do_you_use_cheats /post4


EDIT: Quote of the original post
avatar
lazycade: So I wanna try using cheat mode,
but because I got this for free from GOG and it's not in my steam library,
I don't know how to do it. Other lists say to get a patch then look for a specific file
and edit it but I can't find it in the game's files.
A little help here... please?
Post edited November 02, 2014 by NotCompatible