PKG (Package) is a compressed file format originally used by Sony for digital PlayStation Store content. In the homebrew community, converting a PS2 game to a PKG turns it into a "PS2 Classic," allowing it to appear directly on your XMB (main menu) as if you had bought it digitally from Sony. The Core Process: ISO to PKG Converting your legal backups into an installable format typically requires a PC and specific tools. PS2 Classics GUI

🔐 You may need a PS3 firmware file ( PS2U.ROM / PS2E.ROM ) for the emulator wrapper. These are extracted from an official PS2 Classics game.