Sonic Heroes PAC sound files

Quite simply, I have searched everywhere for this fabled utility, with limited success. What I'm looking for is an apllication which can unpack the samples from the PAC files in the PC version of Sonic Heroes. I need no packing utility, all I need is the unpacker. It supposedly exists somewhere out there, but unfortunately I seem to be cursed never to find out where =\

Also, if I've posted this in the wrong forum, please accept my apologies and move this to where it should be.