I don't like having python installed so this has been ported to a semi-posix compliant shell script (requires xdg-open and sed) the diffrance between this and the original script is that this can be used to export/import a minimal version of the steam game manifest(which you can modify in case you don't wan't tools/ proton showing up)
steam_dmenu.sh -d 'bemenu -i'
steam_dmenu.sh -o > games
cat games | steam_dmenu.sh -d 'bemenu -i'