Metal Gear Solid Portable Ops

[SHREDDER]

Hi I am new here so first of all hi! ok, i downloaded today PPSSPP emulator and started using it. So i try to play Metal gear Portable ops. But when i click load and then i select the Metal gear portable ops cso file it says that file is corrupt and the game dont starts. Then i renamed the file from cso to iso but again i get the same error. Any suggestions?? Help please!! This is the first time that i use the emulator