A "PKG" file in this context typically refers to the digital package format used by the PS3 for its software, often sought out by users with modified consoles (CFW/HEN) to play delisted content. 🕹️ Game Overview March 13, 2006 (PS2/Xbox).
Because the game is widely celebrated for its massive car list and "Remix" content (like the Tokyo map), many players in the modding and homebrew communities create custom PKG files to run the PS2 version on PS3 consoles via emulation. If you are looking to revisit this classic on your PS3, Midnight Club 3 Dub Edition Remix Ps3 Pkg