GTA V on a mobile device, you must use streaming or cloud services rather than an emulator:

If prompted, select or "Merge" to replace the existing emulator folders. Load the Game in PPSSPP Open the PPSSPP app. Go to the "Games" tab and click "Browse" .

:

Use an app like ZArchiver to extract the .7z or .zip file until you get an .ISO or .CSO file.