https://bugs.winehq.org/show_bug.cgi?id=39403
--- Comment #52 from Robert Walker bob.mt.wya@gmail.com --- (In reply to James Lin from comment #51)
According to this:https://gist.github.com/davispuh/6600880 Does it seem that "-no-cef-sandbox" parameter works?
Damn... Nice catch (wonder when they sneaked that one in)... I'll add that to the AppDB Steam wiki page. Hopefully I'll less Ubuntu users moaning at me now :-)
Confirmed as a (finally) viable workaround with Wine Staging 1.9.6 (rebuild without Crossover patch) - 32-bit/64-bit Wineprefix support.