This problem has hassled me forever, even fixed it before and then it mysteriously broke again - that's becuase the fix must be applied any time Setpoint is re-installed or a newer version is installed.
THE FIX:
Find Setpoints "players.ini" which on my PC is in C:\Program Files\Logitech\SetPointP
Open that file with Notepad(you may need to first rename it to players.txt and then back to players.ini after saving it) and paste what is below. What's below adds Musicbee as a supported player to Logitech's default mediaplayer list:
#List of supported players
#{btn|key|msg|emg|cmd|wac},exeName,wndClass,wndCaption,xxx,play_delayplay,pause,stop,prev,next,remove_flags,ShowOSD,menu_item
#special char --> ^ ctrl;+ shift+ctrl; $ ctrl (no translation); * alt (no translation); @ ctrl+alt (no tanslation); & (no translation)
[Players]
MusicBee=key,MusicBee.exe,WindowsForms10.Window.8.app.0.2bf8098_r11_ad1,xxx,xxx,&0xB3,&0xB3,&0xB2,&0xB1,&0xB0,0,1,MusicBee
MusicMatch7=wac,MMJB.EXE,MMJB:MAINWND,xxx,xxx,xxx,xxx,xxx,xxx,xxx,0,1,MusicMatch
MusicMatch=cmd,MMJB.EXE,xxx,MusicMatch Jukebox 4,xxx,0x101F4,0x18059,0x101F5,0x101F6,0x101F7,0,1,MusicMatch
MDesktop=wac,MDesktop.exe,MediaDesktopClass,Media Desktop,xxx,xxx,xxx,xxx,xxx,xxx,0,1,Media Desktop
PowerDVD=key,PowerDVD.exe,xxx,CyberLink PowerDVD,xxx,0x0d,0x20,S,P,N,0,1,Power DVD
WinDVD=wac,WinDVD.exe,WinDVDClass,Player,xxx,xxx,xxx,xxx,xxx,xxx,0,1,Win DVD
WinDVD4=key,WinDVD.exe,WinDVDClass,InterVideo WinDVD 4,xxx,0x0d,0x20,0x23,0x21,0x22,0,1,Win DVD
WinDVD5=key,WinDVD.exe,WinDVDClass,InterVideo WinDVD 5,xxx,0x0d,0x20,0x23,0x21,0x22,0,1,Win DVD
WinDVD6=key,WinDVD.exe,WinDVDClass,InterVideo WinDVD 6,xxx,0x0d,0x20,0x23,0x21,0x22,0,1,Win DVD
WinDVD7=key,WinDVD.exe,WinDVDClass,InterVideo WinDVD 7,xxx,0x0d,0x20,0x23,0x21,0x22,0,1,Win DVD
iTunes_104=wac,iTunes.exe,ITWindow,xxx,xxx,xxx,xxx,xxx,xxx,xxx,0,1,iTunes
iTunes=wac,iTunes.exe,ITunes,xxx,xxx,xxx,xxx,xxx,xxx,xxx,0,1,iTunes
MSMedia9=wac,wmplayer.exe,WMPlayerApp,Windows Media Player,xxx,xxx,xxx,xxx,xxx,xxx,0,1,Windows Media Player 9
MSMedia7=wac,wmplayer.exe,WMP Skin Host,Windows Media Player,xxx,xxx,xxx,xxx,xxx,xxx,0,1,Windows Media Player 7
MediaCenter=wac,ehshell.exe,eHome Render Window,xxx,xxx,xxx,xxx,xxx,xxx,xxx,0,1,Windows Media Center
WinAmp3=key,studio.exe,STUDIO,xxx,xxx,X,C,V,Z,B,0,1,WinAmp 3
WinAmp3d=key,winamp3.exe,STUDIO,xxx,xxx,X,C,V,Z,B,0,1,WinAmp 3d
Rhapsody=key,Rhapsody.exe,xxx,Rhapsody,xxx,^P,^P,^S,^B,^F,0,1,Rhapsody
#YahooMusicEngine=key,YahooMusicEngine.exe,YMPFrame,xxx,xxx,^ ,^ ,^S,$0x25,$0x27,0,1,Yahoo! Music Jukebox
YahooMusicEngine=key,YahooMusicEngine.exe,YMPFrame,xxx,xxx,^ ,^ ,^S,$0x25,$0x27,0,1,Yahoo! Music Jukebox
RealOne=wac,realplay.exe,GeminiWindowClass,xxx,xxx,xxx,xxx,xxx,xxx,xxx,0,1,RealOne Player
WinAmp5=cmd,winamp.exe,Winamp v1.x,xxx,xxx,40045,40046,40047,40044,40048,0,1,WinAmp 5
MediaLife=key,Medialife.exe,MediaLife Frame class,Logitech MediaLife,xxx, , ,S,P,N,0,1,MediaLife
MediaLife4=wac,Medialife.exe,MediaLife Koan GDI Class,xxx,xxx,xxx,xxx,xxx,xxx,xxx,0,1,MediaLife
PLAYDVD=key,PlayDVD.exe,PlayDVD Frame class,Play DVD,xxx, , ,S,P,N,0,1,PlayDVD
Nero=wac,NeroHome.exe,xxx,xxx,xxx,xxx,xxx,xxx,xxx,0,1,NeroHome
Nero2=wac,ShowTime.exe,xxx,xxx,xxx,xxx,xxx,xxx,xxx,0,1,ShowTime
Nero3=wac,Nero.exe,xxx,xxx,xxx,xxx,xxx,xxx,xxx,0,1,Nero
BaoFeng=key,storm.exe,xxx,xxx,xxx, , ,$0x53,&0x21,&0x22,0,1,Bao Feng
Koowoo=key,KwMusic.exe,xxx,xxx,xxx,$0x74,$0x74,$0x75,?0x25,?0x27,0,1,Koowoo
TTing=key,tting.exe,xxx,xxx,xxx,@0x4f,@0x4f,@0x4f,@0x25,@0x27,0,1,TTing
#Pctutu=key,PPStream.exe,xxx,xxx,xxx, , ,^S,^0x21,^0x22,0,1,Pctutu
[Players.Run]
MediaCenter=path,$WINDOWS\eHome
WinAmp3=reg,HKLM,SOFTWARE\Classes\Winamp3.File\DefaultIcon,,2
Rhapsody=reg,HKCR,rhap\DefaultIcon,,5
WinAmp5=reg,HKLM,SOFTWARE\Classes\Winamp.File\DefaultIcon,,2
YahooMusicEngine=reg,HKCR,TypeLib\{2C5EBFB1-9174-4FE8-88DB-D1F460A9E83B}\1.0\0\win32,,
Koowoo=reg,HKLM,SOFTWARE\Classes\kwfile_ksf\shell\open\command,,5
[Players.Display]
MediaCenter=Windows Media Center
RealOne=RealOne Player
WinDVD=WinDVD
WinDVD4=WinDVD4
WinDVD5=WinDVD5
WinDVD6=WinDVD6
WinDVD7=WinDVD7
MediaLife=MediaLife
PLAYDVD=PlayDVD
#{btn|key|msg|emg|cmd|wac},start,end,repeat start,,Donot send Play appcommand at end of FastForward operation
[Players.Seek]
MusicMatch7=cmd,22861,xxx,1
MediaLife=wac,xxx,xxx,1,0
MediaLife4=wac,xxx,xxx,0,1
PowerDVD=wac,xxx,,0,1
MediaCenter=wac,xxx,xxx,0,1
PLAYDVD=key,F,,0,1
iTunes_104=wac,xxx,xxx,1,0
iTunes=wac,xxx,xxx,1,0
WinDVD7=key,F,0x0d,xxx,0
WinDVD6=key,F,0x0d,xxx,0
WinDVD5=key,F,0x0d,xxx,0
WinDVD4=key,F,0x0d,xxx,0
WinAmp5=cmd,40060,xxx,1,1
MSMedia9=wac,xxx,xxx,0,0
RealOne=key,^],,2,1
#{btn|key|msg|emg|cmd|wac},start,end,repeat start,Donot send Play appcommand at end of rewind operation
[Players.Rewind]
PowerDVD=wac,xxx,,0,1
MusicMatch7=cmd,22860,xxx,1,0
MediaLife=wac,xxx,xxx,1,1
MediaLife4=wac,xxx,xxx,0,1
MediaCenter=wac,xxx,xxx,0,1
PLAYDVD=key,B,,0,1
iTunes_104=wac,xxx,xxx,1,0
iTunes=wac,xxx,xxx,1,0
WinDVD7=key,R,0x0d,xxx,0
WinDVD6=key,R,0x0d,xxx,0
WinDVD5=key,R,0x0d,xxx,0
WinDVD4=key,R,0x0d,xxx,0
WinAmp5=cmd,40061,xxx,1,1
MSMedia9=wac,xxx,xxx,0,0
RealOne=key,^[,,2,1
#list of Burn UI players (available on Burn button)
[Players.BurnSupported]
MSMedia9=True
MusicMatch7=True
Nero3=True
#list of Record UI players (available on Record button)
[Players.RecordSupported]
MSMedia9=True
MusicMatch7=True
Nero3=True
#list of 10" UI players (available on remote button)
[Players.IsRemote]
MDesktop=Trues
MediaCenter=True
MediaLife=True
WinDVD=True
WinDVD4=True
WinDVD5=True
WinDVD6=True
WinDVD7=True
PowerDVD=True
PLAYDVD=True