CPK is a proprietary archive format used by CriWare and adopted by Konami for the Pro Evolution Soccer series. Think of it like a .zip or .rar file designed specifically for video games. These archives house virtually all the game's assets: Player faces, custom kits, boots, and HD turf.

Usually none (or standard) to prevent game crashes. File Extension: .cpk .

Click the Build CPK File button and save it to your desktop. Part 2: The "Fix" — Installing and Activating