.cso

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Compressed ISO
File extension: .cso
Type of format: Disk image
Container for: ISO images

.CSO is a compression method for the ISO image format. It is used to compress dumped PlayStation Portable UMD games, and is an alternative to the .DAX compression method.

At one time, .DAX was the compression standard among PSP games. However, with the wildly popular homebrew application "DevHook" using the .CSO compression standard, .CSO has become more popular.

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