FF10 Song request: Braska’s Final Aeon

This has been driving me insane for the last couple of days. I have been using SoulSeek and been searching the web trying to find an MP3 of the super sweet Otherworld remix that’s played when fighting Jecht as an Aeon. I’m not interested in the Otherworld song played at the beginning of the game, nor the perky remix done by the Black Mages. This Otherworld version I’m looking for is not on the official OST, and I’ve had no success finding it.

Can anyone direct or recommend me to a place that may have the MP3?

EDIT: OK, it looks like I found a PSF2 file from Zophar’s Domain. Now the question is how in the world do I open this thing? I’ve downloaded WinAmp and installed the Highly Experimental plugin for PSF files. I keep trying to play the song from the FFX RAR file, but it’s not playing. The song is still listed as a minipsf2 file. How do I change that?