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>> CSO file

CSO file format description

Many people share .cso files without attaching instructions on how to use it. Yet it isn’t evident for everyone which program a .cso file can be edited, converted or printed with. On this page, we try to provide assistance for handling .cso files.

1 filename extension(s) found in our database.

.cso - CSO Compressed PSP ISO Image

CSO file is a CSO Compressed PSP ISO Image. CSO is used to compress dumped Sony PlayStation Portable (PSP) UMD games.

.cso file format description:
CSO format
ISO Compressor
Disk Image files
- / -
CSO Compressed PSP ISO Image related links:
CSO Compressed PSP ISO Image related extensions:
gBurner Image
Track-at-Once CD/DVD Image
RollBack Rx Snapshot Data
RatDVD Compressed Disk Image
WinMount Image
Atari ST Standard Floppy Disk Image

Naturally, other applications may also use the .cso file extension. Even harmful programs can create .cso files. Be especially cautious with .cso files coming from an unknown source!

Can't open a .cso file?

When you double-click a file to open it, Windows examines the filename extension. If Windows recognizes the filename extension, it opens the file in the program that is associated with that filename extension. When Windows does not recognize a filename extension, you receive the following message:

Windows can't open this file:


To open this file, Windows needs to know what program you want to use to open it. Windows can go online to look it up automatically, or you can manually select one from a list of programs that are installed on your computer.

To avoid this error, you need to set the file association correctly.

The .cso file extension is often given incorrectly!

According to the searches on our site, these misspellings were the most common in the past year:

cco, vso, so, fso, cxo, csl, csi, cos, ceo, xso, sso, sco, dso, csp, csk

Is it possible that the filename extension is misspelled?

Similar file extensions in our database:

CodeCheck Object File
Adobe Flash Media Server Remote Shared Object
InterSystems Cache Server Page
Adobe Encore Color Set
Winevar Worm Executable
Microsoft IIS Schema Backup

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