Did you find a CSO file on your computer and wonder what program should open it? Maybe someone emailed you a CSO file but you're not sure how to use it. Perhaps you tried to open the CSO file but Windows told you that it could not open it.
Before you can open a CSO file (assuming it's even a file format that's intended to be viewed or edited), you'll need to determine what kind of file the CSO file extension refers to.
Other types of files may also use the CSO file extension. If you know of any additional file formats that use the CSO extension, please let me know so I can update this information.
How to Open an CSO File:
The easiest way to open a CSO file is to double-click on it and let your PC decide which default application should open the file. If no program opens the CSO file then you probably don't have an application installed that can view and/or edit CSO files.
Warning: Take great care when opening executable file formats received via email or downloaded from websites you're not familiar with. See my List of Executable File Extensions for a listing of file extensions to avoid and why.
As far as I know, the only program that will open CSO files is PSP ISO Compressor. If you know of any others, please send me a quick email and let me know the name of the program so I can update this page.
Tip: Use Notepad or another text editor to open the CSO file. Many files are text-only files meaning no matter the file extension, a text editor may be able to properly display the file's contents. This may or may not be the case with CSO files but it's worth a try.
If you find that an application on your PC does try to open the CSO file but it's the wrong application or if you would rather have another installed program open CSO files, see my How to Change the Default Program for a Specific File Extension guide for making that change in Windows.
How to Convert a CSO File:
There are two main ways to attempt to convert a CSO file to another file type:
- Open the CSO file in its default program and choose to save the open file as another file format.
- Use a File Conversion Online Service or Software Program to convert the CSO file to another file format.
The first option involving opening the CSO file in its native program is preferable because it's both easier and will probably result in a more accurate file conversion. Of course if you don't have a program that opens CSO files, a third-party file conversion tool (the second option) could be very useful.
Important: You cannot usually change a file extension (like the CSO file extension) to one that your computer recognizes and expect the newly renamed file to be usable. An actual file format conversion using one of the methods described above must take place in most cases.
Still Having Problems Opening or Using a CSO File?
Let a community of computer support enthusiasts help out! Post in the PC Support Forum about what kinds of problems you're having with opening or using the CSO file and we'll see what we can do to help.
