CSO File Type

- The quick facts

What are CSO files and how to open them

Are you having problems opening a CSO file or just wondering what they contain? We explain what these files are used for and show you software that we know can open or otherwise handle your files.

What is a CSO file?

CSO files have multiple uses, and Compressed ISO Disk Image is one of them.

Compressed ISO Disk Image

Files containing the .cso file extension are compressed image files that are most commonly used to archive games designed for use on the Playstation PSP portable gaming system. The CSO file format was the first compression method for ISO file purposes.

The CSO files are saved in an ISO disk image format and may contain up to nine levels of compression. It is important to note that the more compression a CSO file has, the longer it will take for the disk image to load. This can significantly impact the user's gameplay or computing experience.

How to open CSO files

Important: Different programs may use files with the CSO file extension for different purposes, so unless you are sure which format your CSO file is, you may need to try a few different programs.

While we have not verified the apps ourselves yet, our users have suggested 2 different CSO openers which you will find listed below.

Last updated: June 18, 2022

More file formats using the CSO extension

Through our research of CSO files, we know that the following formats exist. However, we have not yet analyzed them in detail.

  • DirectX Compiled Shader Object

Various apps that use files with this extension

These apps are known to open certain types of CSO files. Remember, different programs may use CSO files for different purposes, so you may need to try out a few of them to be able to open your specific file.

uTorrentuTorrentUser submitted
DAEMON ToolsDAEMON ToolsUser submitted

Help us help others

File.org helps thousands of users every day, and we would love to hear from you if you have additional information about CSO file formats, example files, or compatible programs. Please use the links below or email us at submit@file.org to discuss further.