How to Extract CSO Files

Written by ray padgett
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A CSO file is a compressed version of an ISO disk image. Sony PlayStation Portable (PSP) devices typically store game files on the computer as CSOs, since they take up less room than the full ISO. Windows does not offer a tool to extract CSO files natively, but there are several third-party options that will do the trick. This will leave you with an uncompressed ISO disk image that you can run on your computer.

Skill level:
Moderately Easy

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Things you need

  • PSP ISO compressor, such as UMDGen, Ciso Plus or PSP ISO Compressor

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  1. 1

    Extract CSO files with UMDGen (see Resources). This free program offers a simple interface, allowing you to simply drag a CSO file in the main window for extraction to begin.

  2. 2

    Extract CSO files with Ciso Plus (see Resources). This program works like UMDGen but also allows you to compress ISO files to CSOs. Unfortunately, the most recent update dates from September 2007. If you have a PSP model released since then, it cannot be confirmed to work.

  3. 3

    Extract CSO files with PSP ISO Compressor (see Resources). This tool offers the most basic interface but also the smallest file size. You simply load the input file and leave output blank. Be sure the button "Uncompress CSO -> ISO" is checked; otherwise, the program will give you an error.

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