As he plugged in the PS3, a realization hit him: he had left some of his favorite games on the console, and transferring them to his PS4 would be no easy feat. The PS3 used a format known as .PKG (Package) files for game installations, which the PS4 couldn't natively read.
The Last Conversion
The sad truth: . The PS4 lacks an SPU (Synergistic Processing Unit) emulator, so heavy Cell games fail. ps3 to ps4 pkg