It should be user/usrcheat.dat, not "cheats". Most of what you find is the user version because that's unencrypted, the other versions are encrypted and nobody wants to bother with that shit when the unencrypted versions work just fine for everybody else.
Wood should come with a cheat file, that's the file you need to replace with a new one (so you know it's in the right folder), did it come with one?