Strange file Format(Game Cube Files)

[Demonslayerx8]

So recently, ive began trying to rip game data off of my gamecube games, and I was specifically looking for model files. What I came across was file format called ".fpk". Could someone explain what this file format is about?Is it animation files, model files, or just data variables? (Some extra info is that I was looking at "Bloody Roar: Primal Fury.)

download a fpk unpacker. Tatsunoko vs Capcom uses the same format for its game, same with the naruto games on the Wii. (along with compressed files in castlevania judgement)