It's not BitDefender, it's not "certain AV." It doesn't necessarily suggest trust on your part when you say "We're not really sure why ... There's nothing we can do about it."
In the past three years I've had this computer, your file is the only one that got flagged by Windows Defender (which, I never even knew was running until I downloaded this ZIP).
You should do better than "We know but tough shit lol."