To the layman, a .cpk was just a container, like a .zip file. But to a programmer, it was a fortress. It was a "Crypted Package." The header was obfuscated, the file table was hashed, and the compression algorithm was custom-written by a paranoid lead engineer back in 2012.
Open Command Prompt in the CriPakTools folder. Run: cpk file editor
CPK files are a proprietary archive format developed by (CRIWARE) to store game data such as audio, graphics, and video. A CPK file editor or "packer/unpacker" is a specialized tool used to view, extract, or repack these archives, primarily for the purpose of video game modding. Core Functions of CPK Editors To the layman, a