How to Change a CSO File to ISO Format
CSO stands for "Compressed ISO." It is a format used by the game console Portable Sony Playstation, or the PSP. This format is simply a compressed CD image. In order to use this format on your computer, you'll have to decompress the format into "regular" ISO, so that it can be used by a program that can run the ISO format.
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Instructions
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Visit a website that has a PSP decompressor available for download. An example would be the one from PSP-Hacks (see Resources).
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Download the program and open it. Since it is in ZIP format, you may need to download and install a program that can open ZIP format first, such as WinRar (see Resources).
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Open the ZIP file and activate the compressor EXE file by double-clicking on it.
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Click on the button with the three dots on it ("...") next to the box labelled "Input File(s)." Find your CSO file and double-click on it.
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Click on the circle on the left next to the text that reads "Uncompress CSO-ISO." Then click "Compress" at the bottom of the program to begin the conversion.
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