I have a .cpk file that needs to be extracted. So I tried to extract it in windows. But there are some illegal characters in that CPK file, so I couldn't open it. So, I tried to do it in Ubuntu. So, I downloaded
CPKtools by kamikat.
Kamikat tool - https://github.com/kamikat/cpktools
But it didn't work as I intended. Maybe because it is outdated.
WHAT IS CPK FILE?
Game package file used by games created with the CRI Middleware packaging software; can store graphics, audio, and other game data; used as a container for game files.
CRI Middleware technology is used to package data for various game console systems, including those from Microsoft, Nintendo, Sega, and Sony.
Pro Evolution Soccer and Dragon Ball Z games use this file format.
WHAT IS CPK TOOLS?
CPK tools like CriPakTools, YACpkTools, CPK Unpack & Repack tools etc. extracts .cpk files and also compresses into .cpk files.