It's a problem related to Multimedia Fusion 2. For MMF2 to run, it extracts its runtime and a bunch of extension files which is placed in a temporary system directory (it's removed automatically when exiting the application, or if the game crashes the files are left there to automatically be removed by Windows instead). Now, let's say somebody creates malware in MMF2; the antivirus company will get this executable, and analyze its content. It's very unlikely it will figure out it's MMF2's events (the game script so to say) that makes the tool malicious, they'll incorrectly link the malicious behaviour to one of the extensions or the MMF2 runtime itself, and add that to the antivirus database.
That's why once in a while, every existing MMF2 application is suddenly reported to be a virus, upon which it's reported back to the antivirus developers who hopefully fixes it. Some antiviruses (like Comodo which I use) don't seem to have this problem at all, while others keep reporting MMF2 stuff all the time like they didn't learn anything from their previous mistakes.
Basically, it's really annoying
