I can kind of confirm these findings. If I set `WINEDLLOVERRIDES="winmm=n,b" %command%`, I do get the music and the game wants to start full screen (I would say: it does, but I am not seeing it and can't coerce the windo...
My suspicion about `winmm.dll` was correct. When starting with `WINEDLLOVERRIDES="winmm=n,b" %command%`, the game starts in fullscreen (!), libogg and libvorbis are loaded, music is playing... but the window does not dis...