What to do with CSO files on a PSP emulator?

Updated April 17, 2017

“PSP” stands for Play Station Portable and is a games console made by Sony. A PSP emulator is a program that allows you to play a PSP game on a PC or Mac. PSP emulators are also available for iPhones, iPads and Android devices. A CSO file is a compressed ISO file. The ISO file is an image of a disc. This enables you to store the contents of a DVD in a directory on your computer.


PSP emulator programs source the programs for games through ISO or CSO files rather than from a DVD. Gamers download CSO files in preference to ISO files because, being compressed, they are smaller files and take less time to download. The original games are written onto discs with the UMD format rather than DVDs. However, ISO images can be made from UMD disks.


Popular PSP emulators include PPSSPP and Jpcsp (see Resources). Jpcsp runs on Windows, Linux and Mac OSX. PPSSPP runs on Windows and Linux also on Blackberry, Mac OSi and Android platforms. These two programs are freeware, but you will have to compile the source code to get them installed and working.

CSO on smart phones

When running PPSSPP on a smart phone, you need to copy the CSO file of the came you want to play onto the phone’s SD card. When you open the PPSSPP app, you will be shown a welcome screen. This includes a “Load” button. Press the button and then navigate with the file browser that pops up to find the CSO file. Once you have directed the program to the CSO file it will load and start automatically.


You can store your CSO files anywhere on the PC. As with PPSSPP on a smart phone, the program presents you with a welcome screen that includes a “Load” button. Pressing this button leads to a file browser. Navigate to the file, click on it and press the “open” button to load and start the game.

CSO on Macs

Copy your CSO files to the umdimages directory of the Jpcsp directory structure. Run Jpcsp and click on “File” in the menu bar. Select “Load UMD.” You will be presented with a list of files in the umdimages directory. Select the game and press “Load.” Click the “Run” button in the main screen to start the game.

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About the Author

Stephen Byron Cooper began writing professionally in 2010. He holds a Bachelor of Science in computing from the University of Plymouth and a Master of Science in manufacturing systems from Kingston University. A career as a programmer gives him experience in technology. Cooper also has experience in hospitality management with knowledge in tourism.