https://bugs.winehq.org/show_bug.cgi?id=43910
--- Comment #53 from PeterG peter.g.anderson@live.co.uk --- Here is the full line from my shortcup to launch Ballt.net as a reference. The path will differ fir everyone else of course.
Exec=env WINEPREFIX="/wow" __GL_SHADER_DISK_CACHE_PATH="/wow/drive_c/wow/GLCache" __GL_THREADED_OPTIMIZATIONS=0 STAGING_SHARED_MEMORY=1 WINEDEBUG=-all /usr/bin/wine "/wow/drive_c/Program Files (x86)/Battle.net/Battle.net.exe"