In your emulator or console menu, select "Install Packages" and point to the God of War III PKG file.
The Sony Computer Entertainment logo appeared, but it wasn't accompanied by the usual orchestral swell. It was silent, save for the sound of howling wind.
He pressed the button to patch the files. The PS3 beeped three times. Then, it rebooted.
The term PKG refers to PlayStation Network packages, which essentially are digital versions of games or add-ons available for download on the PlayStation Store. For God of War III, a PKG deal would imply the availability of the game or its components in a digital format.
Jax tried to pause, but the game wouldn't let him. The .rap file hadn't just unlocked the game; it had unlocked a debug mode the developers left in.
If you are moving away from physical discs and toward digital backups, these two file types work together like a lock and a key.