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.
Product(s) that can open CSO file
PSP ISO Compressor
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 allows you to port older...