Naruto Ultimate Ninja (1) for PS2

[Kokonoe]

It's a bunch of gzip files stuck onto each other, which can be extracted using offzip. The resulting files have filenames and such in them but I'm not quite sure how to get files out of those.

I downloaded offzip and dragged data.bin onto it, but it created a file with 0 bytes. Did I do something incorrect?

Perhaps I misread, I was gonna try to tinker with it.