https://bugs.winehq.org/show_bug.cgi?id=39403
--- Comment #40 from Andrew Dunai anderson.dunai@gmail.com --- Created attachment 53603 --> https://bugs.winehq.org/attachment.cgi?id=53603 cefclient.exe crash report
Seems like Steam is using CEF, so I tried running CEF client app (bot x86 and x64 versions) under different wine prefixes & archs (.wine32 and .wine) - the result is the same.