https://bugs.winehq.org/show_bug.cgi?id=45277
--- Comment #99 from Rafał Mużyło galtgendo@o2.pl --- Additional note: if I set 'emulate desktop' with winecfg, the app's window is still non-responsive, but wine's desktop window can be closed and just before it closes, the app window closes inside the desktop window.
Not sure how that's implemented, so this may or may not matter.