No, Defender will do that depending the time of the month (sounds like a woman, eh), depending on definition updates.
You should also see what the actual threat is. More than likely, you are getting the WacatacB!ml message, which will hit many Ren'Py games.
WacatacB!ml also known as "machine learning", Defender is telling you that it thinks/could/might be a virus, not an actual virus. It is a
well-known false positive.
If in doubt, you can always uploaded the "exe" to
You must be registered to see the links
.