Open CPK files in your browser
The archive of CRI Middleware's file system, which a great many Japanese games keep their data in. Open one right here as a folder, without the game. Nothing leaves your device.
Or drop it anywhere on this page
What you'll see
Your file opens like a folder, its files listed on the left, with a page beside them on what it is and what it holds.
- Listed like a folder • Unpacks only what you pick
- A page on what it is • From its own manifest or index
- Pictures, sounds and text • Each opens in its viewer
- Export • Save as ZIP or Extract all
About CPK
CRI Middleware's tools are in a great many games, most of them Japanese: ADX and HCA for sound, Sofdec for video and the CRI File System for data, whose archives are CPK files. Sonic, Persona and Dragon Ball games keep their models, textures, scripts, sounds and movies in them, and modders take them apart and pack them again.
A CPK starts with CPK and a header packet, an @UTF table of its settings, and keeps its table of contents in another: each file's folder, name, place, size and the size it unpacks to, or only an ID in games that ask for files by number. A packet can be masked with a key every CPK tool carries, and files are often packed with CRILAYLA, CRI's own compression, which unpacks from the end.
Filepeek reads the tables, unmasked where they're masked, and lists the files in their folders, each unpacked from CRILAYLA only when you pick it. ADX and HCA sounds play, ACB banks open as their sounds and pictures and text in their own viewers. The page counts the files by kind and names the tool that built the archive.
CRI archive
.cpk
Format
- MIME type
- application/octet-stream
- Made by
- CRI Middleware
Inside the file
- Tables
- @UTF, plain or masked
- Contents
- Folders and names, or IDs
- Packed
- With CRILAYLA, file by file
- Often holds
- ADX, HCA, ACB and USM
Opens in every browser
Filepeek opens a CPK as a folder in Chrome, Edge, Firefox and Safari. On their own, browsers only download it.
- YouChromeOpens through Filepeek
- YouEdgeOpens through Filepeek
- YouFirefoxOpens through Filepeek
- YouSafariOpens through Filepeek
Apps that open CPK
- WindowsCriPakTools • YACpkTool
- MacNo app opens it
- iPhone and iPadNo app opens it
- AndroidNo app opens it
Questions
How do I open a CPK file?
Drop it on this page or choose Peek a CPK. Its files are listed in their folders, and each one opens or saves on its own.
Why are the files named by number?
Some games ask for their files by ID, and their CPKs keep no names. Filepeek names each by its ID and the kind its first bytes say.
Are its files decrypted?
A CPK's tables are often masked with a key every CPK tool carries, which Filepeek unmasks. Files a game encrypts with its own key, like some HCA sounds, stay shut and say so.
Can I unpack the whole CPK?
Yes. Extract all writes every file into a folder in Chrome and Edge, and Save as ZIP works everywhere, each file unpacked from CRILAYLA on the way.