

"WINEDLLOVERRIDES='winmm.dll=n,b' %command%"
Text is bit small to read
Needed to use launch command to enable music
Saves old saves before using the launch commands won't load music.
No Music without using Launch command
WINEDLLOVERRIDES='winmm.dll=n,b' %command%
Subtitles/Pickup Messages text is small. There is a mod called JKGXMOD which might fix this.
STAR WARS: Jedi Knight - Dark Forces II requres the launch command "WINEDLLOVERRIDES='winmm.dll=n,b' %command%" to cause in game music to playback properly. I tried this command in Mysteries of the Sith, but no music was present in the first stage. Music works in the initial cutscene.
Menu vertical mouse is always inverted from in game vertical Mouse and vice versa.
Works as is without tinkering. Can be launched and played with default Proton version as of writing (March 17 2023), however, there is no in game music playback. The Workaround suggested from the Dark Forces II report page didn't work for me.

Some text on the ui is quite small
Took some adjusting to the controls but game works very well on proton
Go to Display settings, enable 3D Acceleration, then change to Deck's native resolution (1280x800)
Steam overlay wouldn't show up initially, but it started working after a few seconds
Works far better than on Linux desktop