Nobody could grant if that thing is really windows code or a fake. Not without the sender self-identifying as a well known top MS employee having access to it. In that case the sender would be doing something illegal and against MS interests.

The result would be WINE having an advantage to redo the snippet of code in a totally new and different way and MS being forced to show part of its private code, that would expose them also to patent trolls.

Would be a win-win situation for Wine and a lose-lose situation for MS.