The File Extensions Database

.CSO File Extension

  • Category: Disk Image Files
  • Format: Binary

What is an .CSO file?

.CSO is Compressed ISO Disk Image

Compressed .ISO disk image file used for archiving PlayStation Portable (PSP) games; can incorporate up to nine layers of compression; created by program such as Prometeus and YACC (Yet Another CSO Compressor).

NOTE: Greater levels of compression can cause CSO disk images to load slowly.

Programs that open Compressed ISO Disk Image
PSP ISO Compressor
File Type 2 Compiled Shader Object File
Developer by: Microsoft Category: 3D Image Files Format: Binary

File created by compiled .HLSL files written in High Level Shader Language (HLSL), which is shading language developed by Microsoft; contains a compiled shader object, which derives from a HLSL file; retains the same name as the HLSL file but appears as a CSO file after the compile in Microsoft Visual Studio.

In the OpenGL SDK, CSO files can be compiled using the glCompileShader method. glCompileShader compiles HLSL strings into the shader object. Information about whether or not a compilation was successful can be obtained through the shader object's information log by calling glGetShaderInfoLog.

Programs that open Compiled Shader Object File
Microsoft Visual Studio 2017
Microsoft DirectX SDK

How to solve problems with CSO files

  • Associate the CSO file extension with the correct application. On :
    Windows: Right click on any CSO file and then click "Open with" > "Choose another app". Now select another program and check the box "Always use this app to open *.CSO files". Mac: Right click (or Ctrl-click) the CSO file, then click "Open with" > "Other...". Then choose another program and check the "Always Open With" box. Linux: Right click on the file, and select "Open with" and choose another program. iPhone: Tap the file. If you do not see an app to open the file, then tap Share "Share" and choose an app. Alternatively, save the file. Then open the Files app Files app. There long-press on the file, then release your finger. You will see a black menu bar. Then tap "Share" and select an app. Android: Tap the Settings icon on your smartphone, then tap on the Apps section. There tap the Options icon in the top right-hand corner of the screen to change the default apps.
  • Update your software that should actually open .CSO is Compressed ISO Disk Image. Because only the current version supports the latest CSO file format. Search, therefore, e.g. on the N/A manufacturer website after an available .CSO is Compressed ISO Disk Image update.
  • To make sure that your CSO file is not corrupted or virus-infected, get the file again and scan it with antivirus software.