https://bugs.winehq.org/show_bug.cgi?id=46700
mdjrosenau@hotmail.de changed:
What |Removed |Added ---------------------------------------------------------------------------- CC| |mdjrosenau@hotmail.de
--- Comment #8 from mdjrosenau@hotmail.de --- I have nearly the same problem under Ubuntu 16 LTS.
However, it's not only the "keep non-existing file" dialog window but also the "file has changed" dialog window.
And as soon as this dialog window is shown, it is necessary to kill wine using "pkill -KILL". Attempting to do anything else may cause the complete X window system to crash!