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.

You can also open your activity monitor and kill it from there.