https://bugs.winehq.org/show_bug.cgi?id=41573
--- Comment #3 from Olivier F. R. Dierick o.dierick@piezo-forte.be --- I set windows 7 in winecfg and the issue still does not appear.
I noticed that your prefix is 64 bit. Mine is 32 bit. I installed Battle.net from scratch in a clean 64 bit wineprefix set to win 7 and the issue still does not appear (only issue is bug 38845).
I can't reproduce the issue so far.
Do the issue appears if you close Battle.net, backup C:\Program Files (x86)\Battle.net\SystemSurvey.exe and remove it, then restart Battle.net?