.pkg files are package files used by the PS3 for installing software, including games, demos, and homebrew applications. These files contain data that the PS3's firmware can recognize and install. When a user installs a game or application from a physical disc or downloads it from the PlayStation Store, the PS3 often works with .pkg files to manage the installation process.

Create a folder named exdata on the root of your USB and place all files inside it. Installation :

Modern tools like Apollo Save Tool or PSN Patch can automatically activate RAP files from the exdata folder.

These are "Rif Activation Protocol" files. They are tiny (usually exactly 16 bytes) and contain the decryption key needed to activate the corresponding PKG [2, 8]. Without the RAP file, a PKG will install, but the PS3 will display an error message stating that the content has not been renewed or purchased when you try to launch it [5, 8]. How to Install PKG and RAP Files

To use games and applications on a modified PlayStation 3 (PS3), you typically need two types of files: (the software package) and .rap (the license file). Core Definitions