https://bugs.winehq.org/show_bug.cgi?id=40838
--- Comment #25 from winetest@luukku.com --- I retested this now.
I made an account to myself and used local copy of bethesda launcher. The systray shows show and quit options, but trying to quit indeed doesn't seem to work. Wine-staging has fixed the dxdiag popup message you don't see it anymore. I didn't try to install any of the games since I don't have any of the lisences...
The only issues I could see was trying to quit from systray hang the application. The installer updates itself you are able to login in with valid account. Browsing various games works just fine.
wine-staging 2.12