It sometimes appear with trainers and I discovered it because my antivirus decided to put it in quarantine and I had to put it on my exclude list, but it defiantly was tied to the trainer I was using.
I've been searching around the boards, but so far I can only fine people who ran into the problem and nowhere in the FAQ that says exactly what this file is for and why antivirus dislikes it.
* Updated game trainers and cheats daily
* Get notified when new cheats are added
* Request which games get new trainers
* Priority support with any problem