I don't know if PG Music has applied for a patent on RealTracks, or the file layout is protected IP. After all, one loop manufacturer trumpets that their
naming system is patented (although that's not
quite what the actual patent claims). But I digress...
The RealTrack files are (obviously) unencrypted .wma file, and listening to them makes it pretty clear what's going on. To pretend there's some deep secret hidden seems a bit odd.
Now,
staying awake while listening to "raw" RealTracks can be a challenge.

The
real value in RealTracks isn't some sort of proprietary wizardry, but the work that's gone into building them, which is why I suspect other folk haven't been making them: it's a niche market for niche market.
But I don't think many of us on the forum want to put the Benevolent Powers That Be to the test - myself included! So I doubt you'll get a response to your question, even if someone's worked it out.