http://bugs.winehq.org/show_bug.cgi?id=19081
--- Comment #5 from Owen Rudge owen@owenrudge.net 2009-07-22 20:38:33 --- (In reply to comment #4)
It only happens under AutoHotKey, when force closing the parent window. I don't know how to force the parent to close without using AHK.
Yep, I am using AutoHotKey to test. No message pops up for me on OS X.