I'm 95% sure this is a false positive, but I'd like to double check.
I downloaded this trainer from a forum on gamefaqs.com (made by a regular member) and when I extracted it BitDefender went nuts. It says the file is a virus, "Virtool.529" to be exact.
Other members reported getting virus alerts too, and you can see these reports on the aforementioned forum (click the link).
As I understand it, the trainer was made with Cheat Engine, if that matters.
I ran the file in Sandboxie and it seemed clean.
The file is attached in a .RAR archive, with a password of infected, just in case it is indeed a virus!
Cheers 
/applications/core/interface/file/attachment.php?id=3693" data-fileid="3693" rel="">farcry2_trainer.rar