I have similar but slightly different problems.
WIN 10 Music Bee does not show on the list of programs to open files with.
No problem, RMB 'open with' and find the file...
Umm.
and when i search the 50072StevenMayall.MusicBee_kcr266et74avj\ location, there is no .EXE file, or anything else that works either.
So i have no option to associate playlist files with musicbee.