A (Package) file is a digital installer format used by the PlayStation 3 to install games, updates, and applications directly to the console's internal Hard Disk Drive (HDD). Unlike ISO files, which act as virtual discs, PKG files are installed once and appear directly on the XMB (XrossMediaBar) under the "Game" column. File Size: Approximately 7.92 GB for the base game.
Choosing the PKG version of Modern Warfare 2 provides several technical and practical benefits for PS3 users: Call Of Duty Modern Warfare 2 Ps3 Pkg
Once complete, the game icon will appear on your XMB menu. Important Note for Multiplayer A (Package) file is a digital installer format