Since the official PlayStation Store for PS3 is restrictive and older DLC codes may have expired, many users look for PKG files from archival sites.
Move your downloaded Mortal Kombat 9 DLC .pkg files into this folder.
: The iconic horror movie villain, serving as the game's guest character with dual bladed gloves. Compatibility Requirements
Some DLCs require a .rap file to activate. Place these in a folder named exdata on the root of your USB and use a tool like PSNpatch to activate them.