Clone mf-install
git clone https://github.com/z0z0z/mf-install.git
cd mf-install
Comment out 32 bit calls
vi mf-install.sh
#wine start regedit.exe mf.reg
#wine start regedit.exe wmf.reg
wine64 start regedit.exe mf.reg
wine64 start regedit.exe wmf.reg
#wine regsvr32 colorcnv.dll
#wine regsvr32 msmpeg2adec.dll
#wine regsvr32 msmpeg2vdec.dll
wine64 regsvr32 colorcnv.dll
wine64 regsvr32 msmpeg2adec.dll
wine64 regsvr32 msmpeg2vdec.dll
With 5.13 proton selected on steam game (default as of 03/2021) . Find the correct path for the wine prefix, I'm using a diffent mount than defaults for steam games.
export PROTON=~/.steam/steam/steamapps/common/Proton\ 5.13/
WINEPREFIX=/media/steam-games/steamapps/compatdata/983970/pfx ./mf-install.sh