What is a .CSO File And How To Open It (Visual Guide)

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Have you downloaded a file with .cso extension, but you have never seen this extension before? It is important to know how to open this file – in order to be able to work with it. In this article we will explain what .cso file extension is, how to open it and how to work with it.

What is a .CSO file?

The file extension .CSO comes from Compressed ISO Disk Image. This file belongs to the binary format and it is a disk image file.

What to know

There are currently 2 software that can open the .cso file on 1 platform.

How to open a .CSO file?

Below we have written a comprehensive guide on how to open the .CSO file on various operating systems.

How to open a .CSO file on Windows (7, 8, 10)

Below you can see a visual guide on how to open the .cso file on Windows in 4 easy steps.

1. The first step is to download the PSP ISO Compressor software. This software will be used for opening the file. Other software that can be used in opening this file is: UMDGen and PSP ISO Compressor.

Step 2

Step 2: Locating your .CSO file

2. The second step is locating the downloaded file. The file can be usually found in your /download/ folder if you don’t remember where you have downloaded it to.

Step 3

Step 3: Choose “Open with”

3. In the third step, after locating your file, right click on it and click “Open with”.

Step 4

Step 4: Choose the software and click ok

4. After choosing the “Open with” option, you will have an option to choose the PSP ISO Compressor software you have downloaded. Choose your software and click on “OK”. That’s all, now you have opened your file on Windows.

Still cannot open the .CSO file?

If you are still unable to open the .CSO file, it might be because you are trying to open the wrong one. There are many similar file extensions that look like the .CSO file.cso – Microsoft. You might be trying to open the wrong file, please recheck if you are trying to open the right file extension again.


In this article you have learned how to open the .CSO file with the PSP ISO Compressor, UMDGen programs on Windows.