Not much I can do, as it's an unsigned exe.
Any unsigned exe is easily flagged as a virus just "because", unless its digitally signed or the AVs servers encountered it on enough machines long enough to stop considering it a virus.
Gonna be real, this is pretty hardcore misinformation, and dangerous at that. If that were true, you could go on Github, grab just about any repo with recent changes, compile it and expect to get 20+ detections, but that's just not the case.
For what it's worth, Multimedia Fusion is an absolute mess known for this kind of stuff, but generally speaking, that's super bad info.
I stated many times through these comments that Fusion is very often flagged as a virus and 3D2D suffers for that though.
You are right with what you say and I admit I didn't word my sentence properly. With "any" I didn't mean "every single unsigned exe", I meant that that a random unsigned exe can be flagged as a virus.