Quoting DAvenger :
"After long hours of persuading, bribery and other illegal activities I managed to convince RadScorpion to create a DirectShow filter which would allow me to playback my MPC (MusePack) encoded files in RadLight ... well, he was kinda quick and did it during this afternoon (5 hours). Have fun!
As usually, suggestions are more than welcome!"
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News source: DivX Forums