Rating: 4.5/5
This is a bonus disc of sorts which came with the book "Final Fantasy Complete Works," that includes various resources from the first six Final Fantasy games, including an event viewer for openings and endings, and vehicle information, as well as character files from Final Fantasy VII. Unfortunately it's all in Japanese. It's not really all that interesting, though.
You also need an emulator to run this game. To grab one quickly, please check out our PSX emulators section.