https://bugs.winehq.org/show_bug.cgi?id=38493
--- Comment #10 from Nikolay Sivov bunglehead@gmail.com --- Looks like SetFileCompletionNotificationModes() should really forward to NtSetInformationFile() with FileIoCompletionNotificationInformation class, but that's just something to keep in mind. Anything interesting in +relay with patch applied? It's not really clear if missing function is an actual problem or not. Also you'll probably get more info with +tid,+winsock, as it's likely to be used on sockets.