Not every PS2 game works via emulation. Here are the "Perfect" titles (full speed, no glitches):
Before launching the game, you must launch the or Launcher app to ensure the game is licensed properly. Ps2 Games Pkg For Ps3
A PKG file ( .pkg ) is the standard package format for PlayStation software. When applied to PS2 games, a is a converted ISO image packaged with a "placeholder" or emulator wrapper. Not every PS2 game works via emulation