http://bugs.winehq.org/show_bug.cgi?id=20389
--- Comment #11 from Dmitry Timoshkov dmitry@codeweavers.com 2010-05-26 22:38:14 --- (In reply to comment #10)
Actually pressing Alt-F4 does not work at all, even if pressed twice.
Because pressing Alt+F4 generates WM_DELETE_WINDOW with the obvious consequences.