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CPK is an archive format developed by CRI Middleware. It is used in games for a variety of platforms. Files of this format have a .cpk extension.

The first four bytes of the file always have the value 0x43504B20 ("CPK ").



This tool was made specifically for extracting CPK files. There are countless forks and forks of forks of CriPakTools all made by different people. This is the recommended version. It it a modified version made by wmltogether of a modified version made by uyjulian of a modified version made by esperknight of a modified version made by Nanachi3, itself based on the original version of the tool made by Falo on the XentaX forums. That version itself has several forks which may vary in features. As such, other versions might be worth checking out if this one doesn't have what you are looking for.

Compared to Noesis and QuickBMS, CriPakTools seems to be the only one able to extract CPK files from Nichijou: Uchuujin on the PSP and maybe some other games as well.


For more details on this program, please visit the Noesis page.

Noesis supports the format by default.


For more details on this program, please visit the QuickBMS page.

You can extract CPK archives using this script.

List of games using the format

The list is not complete! Feel free to add other games that are known to use aforementioned format.


Wii U

Nintendo 3DS

Nintendo Switch

PlayStation 3

PlayStation Portable

PlayStation Vita