Files that have the PKG file extension is often used by the Apple OS X operating system. These Apple PKG files often contain installer scripts that are utilized by Mac programs so that they can install software.

The PKG file extension is used for the installation of the Symbian operating system. It contains instructions in text format that are required to create a .SIS file. The app data is not included in this PKG file extension but only the app description, vendor name, etc.

This PKG file extension used by the Microsoft Developer Studio stores app extension like a .dll file (Dynamic Link Library).

A PKG file used by Sony Playstation 3 is downloadable through the Sony PlayStation store and then saved in an encrypted format that is only recognized by compatible Sony devices. It is used specifically for updates, downloadable games, and demos.

The PKG file extension associated with DataFlex contains class and object definitions. Hence, a PKG file is typically compiled into the DataFlex program one time.

This PKG file extension is used by Automise, a powerful automation tool, for the action design settings created in the Automise ActionStudio.

InstallShield, a tool that allows users to create installation packages of Windows apps, is using a PKG file extension files that compile setup package.

MicroSim PCBoard (also known as OrCAD PCB Designer) uses a PKG file extension for exporting and importing data, storing external ASCII package definitions.

The game Midtown Madness uses a PKG file extension for files that contain 3D models and graphics data for the game.

Microsoft Systems Management Server (SMS and also known as System Center Configuration Manager), a PC management and server tool, uses the PKG file extension for files that stores package description.

This PKG file extension is used by HERE Maps for its map data package. The app is a navigation and route planning tool for Android and a number of other operating systems.