Official PKG files often require a corresponding .RAP file (license key) to be placed in an "exdata" folder on a USB drive to activate the game.
If you have a CFW PS3, hunt down a clean, music-complete PKG. If not, the Definitive Edition on PS5 (post-patches) is a respectable second, but nothing beats the original’s soul—especially when it runs through a PKG on Sony’s black monolith. Gta Vice City Ps3 Pkg