• Notes on endianness and alignment; use hexdump to confirm.
  • The modding community is the primary driver of CPK editing. Gamers want to replace character skins, change background music, translate in-game text, or remove graphical censorship. To do this, you must extract the CPK, modify an asset (e.g., a texture file), and repack the CPK so the game reads your new version.

    Modern games (like Persona 5 Royal or Nier Replicant) encrypt their CPK files. A standard CPK file editor cannot read them without a CPK key.