http://bugs.winehq.org/show_bug.cgi?id=16956
--- Comment #52 from hash HASH.DuOrden@gmail.com 2011-11-04 12:29:55 CDT --- (In reply to comment #51)
As long as it's running on the same WINEPREFIX, a different version of wine's wineserver should still be able to kill it (works here with git and 1.3.9).
It never worked for me, wineserver -k not complaining but wine processes stays in memory and finishes when they decide is right.