Windows and many antiviruses began doing their work relatively bad. They flag any new exe that isn't signed by them as a virus. While I get the concept in general, it's still a flawed one that creates a sea of false positives.
I can't do much, other than state that it's 4 years and counting that this keeps happening. I have better things to do than tarnish my reputation with a virus on a game I poured years of work into.
Flag the file as a false positive, and allow it to run if you'd like to play the game.