Can't the XDK extract ALL the files from the ISO? I was told this by someone on the PS2Ownz forum, so I went out and got the XDK. I couldn't figure it out, though.
This is how i figured RIOT was doing their games, because in their rips, they always give thanks to Project X with supplying them with the image. I think they do know how to get the game form the disc, though, because they did re-release all of those Project X games.