File Extension CSO
Information about CSO files and how to open them
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.
- ★★★★★PSP ISO Compressor This enables you to play games on one of Sony's Universal Media Discs on your Playstation Portable. Playing games on UMDs...