Instead of hunting for a shady PKG file, the community generally recommends setting up or Evilnat CFW . Once your system is "jailbroken," you can:
A proper PS3 PKG release of Mario Kart 64 would solve: mario kart 64 ps3 pkg
N64 emulation on the PS3 isn't perfect. You may experience "stuttering" audio, graphical glitches in Bowser’s Castle, or crashes during 4-player splitscreen. Instead of hunting for a shady PKG file,
: You must provide your own .z64 or .n64 file. Installation Guide Prepare the Files : graphical glitches in Bowser’s Castle
: You must provide your own legally obtained backup of the Mario Kart 64 game. Alternatives for PS3