https://bugs.winehq.org/show_bug.cgi?id=43910
--- Comment #24 from Bloody Iron bloodyiron@lanified.com --- Considering that Blizzard is working towards dropping XP completely, this seems very likely to break in the future.
(In reply to tisi from comment #23)
I got the error from helper to go away by adding new configuration in winecfg for battle.net helper.exe
I set it to xp and could login to battle.net again. also this fixed some games for me.