https://bugs.winehq.org/show_bug.cgi?id=49728
--- Comment #1 from Alex Henrie alexhenrie24@gmail.com --- SetWindowFullScreenState is an undocumented Windows 95/98/NT4 function which is not present in XP and later. Interestingly, Appear is smart enough to check whether SetWindowFullScreenState is available before calling it. So one solution might be to simply comment out SetWindowFullScreenState in user32.spec.