get musepack decoder (mppdec)
http://rarewares.org/mpc.html(drop that somewhere on the system path, or some other place if you will use it with the musedrop)
cli to the correct mpc dir, where your mpc files are stored, then something like (in
win32):
mppdec *mpc .
should do the trick. (use scale on clips that get clipped after the process, the decoder will tell you which are like that.)
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simple gui way is to use musedrop thingy as a gui to the mppdec (get it from the same page).