Cerio, I changed the audio file extension from wav to aiff but this does not solve the problem.
This is the first line of the file MetalEV^1-SloppyHat,BellRide_085_Style.txt, from PG Music (PC version):
wavename=MetalEv^_085_Style.wav
Is it identical to the Mac version?
PS: I suspect that your problem is related to the file naming / structure convention used by realdrums. Are you sure that you didn't changed anything?