How to prevent windows defender from deleting excluded steam api.dll file

[Jason Berger1]

I believe windows 10 is marking a steam api.dll file as a trojan. The problem is after adding it to an exclusion list it still deletes the file. I turn off realtime protection. Add file to exclusion list and resume realtime protection. The game will run once or twice before once again being deleted. I also have added the entire folder as a safety measure but still the file gets deleted. Any clues what's up?