https://bugs.winehq.org/show_bug.cgi?id=46746
--- Comment #6 from nocrex@protonmail.com --- Yes this key does exist.
After some testing I found out that you can only launch the game on Windows if this key exists and an instance of Discord is running in the background. Sadly I cannot test if this resolves the problem, since the native Discord client for Ubuntu does not support games and the Windows version launched with wine gets stuck on the updater in the beginning. I also tried to install the Windows version of Discord on my Linux drive with wine, but the setup exits saying DllGetClassObject for ieframe.dll returned error 0x80040111.