The game I was trying to run (Ravendawn) was polluting the stdout with hundreds of CreateFile2 FIXMEs. The game worked fine, probably because the params pointer was NULL, so any non-implemented extra parameters weren't even used and we just forwarded to CreateFileW. So, a simple if was added to check whether the pointer is null, and if it is, we just call TRACE instead of FIXME since in this case it isn't really necessary.