https://bugs.winehq.org/show_bug.cgi?id=38960
--- Comment #48 from fjfrackiewicz@gmail.com --- (In reply to Sebastian Lackner from comment #44)
Wine Staging 1.9.21 contains a more complete implementation of SetFileCompletionNotificationModes which should allow Steam to get past the issue in Win7 mode (see "Staged patchset" reference). I'm also planning to send it upstream during the next few days. Could you please retest?
I am not sure if this is relevant so apologies in advance but in Wine-Staging 1.9.21 Steam's webhelper now only crashes when you exit Steam by clicking "Steam" in the client and then selecting "Exit"
Problem is that the backtrace never manages to actually load on my system. As I type this, the debugger is still "Loading detailed information, please wait..." in the window where you would see the backtrace.