I can't force quit an app (Wine)!
Use Terminal to kill the Wine process.
From the Wine FAQ

10.2 Crashes and Freezes
10.2.1 My program froze up, how do I close it?
If you ran the program from a terminal window by typing wine
program.exe, you can usually just go back to that terminal window and
press Ctrl+C. If you ran the application some other way, such as from
a launcher shortcut, then you can open up a terminal and forcibly kill
the process:
killall -9 Application.exe

If you want to kill all Wine programs at once, you can run:
wineserver -k 

You can also open up a Wine version of the Windows task manager by
running wine taskmgr in a terminal. This will allow you to kill
individual Wine processes.