COOP MOD IS SAFE
I tried the coop mod and couldn't get it to work, then someone linked me to this article:http://www.fpscentral.com/index.php?game=9&site=news&id=6521
Now, this interested me as it seemed pretty far fetched to imagine that a pk4 file would be capable of making the game read your CD key and somehow submit it to them, so I checked it out myself.
The contents of the pk4 file is a single file, maps.def. You can open this easily enough as a text file and examine the contents, it's just a plain maps list. No code.
The only way I could see people being able to steal your CD keys is by having a seperate .exe, I really doubt it's at all possible through pk4 files.
So unless there is another coop mod going around, the one on this site (Which is the same as the one on Gamershell) is perfectly safe (Although rather simple/buggy).
AnyOS is probably just making changes to the InstallShield OS check. I know several people have done it themselves.This comment was edited on Aug 5, 14:44.