A PKG file is a package file used by the PlayStation 3. Sony uses this format to deliver digital content through the PlayStation Network (PSN). When you buy a game online, it downloads as a PKG file. Why Do People Use PKG Archives? People use these archives for three main reasons: : Saving digital games so they are never lost. Homebrew : Installing unofficial software made by fans. Convenience : Keeping all game updates in one safe place. How to Use PS3 PKG Files
It's important to understand the legal landscape:
Optical Blu-ray drives fail over time. Archiving software digitally ensures you can play your games even if your disc laser dies.