Playing ripped Atrac3 encoded files from a PSP game?

I have made AT3 files before with the appropriate codec for various PSX games I've converted to play on my PSP, but I decided to rip an ISO from a game I own (said game is F1 2009, by the way) to get the menu music from it. I had listened to it via IRShell and it's appropriate plugin, though when I ripped the file for use to be converted into Mp3, GoldWave (which I used to make the AT3 files) couldn't read the format. This is confusing me and though it isn't really important, I'd very much like help for it.