.bytes, .cpk and others ?

[byxsewaa]

Hello everyone, I'm trying to extract some models from the game JoJo's Bizarre Adventure Diamond Records, but I only find files with extension .bytes, .cpk and other files without extension with names like "4f300aa2b36ca9b45a590b90ea9c840b" ... someone to guide me, with which program or how can I get the MESH and Textures

Thanks