A PKG file is a package of compressed installer files used to install a software program. It is commonly used for installing software in Mac OS X and may be installed individually or referenced by an installer script included with the software.

Double-click the package to install the files. Right-click (Control-click) and select "Show Package Contents" to view the files stored in the package. Apple Installer is the built-in utility for opening PKG files included with Mac OS X.

Game data file used by Midtown Madness 2 (MM2), a 3D racing game; saves a 3D model of a car; located within .AR game archives and can be edited with ZModeler.

A PKG file is a file downloaded from Sony's PlayStation Store, an online store with games, movies, and demos for PS3 and PSP devices. It is saved in an encrypted format that is only recognized by compatible Sony devices and is used specifically for downloadable games, game updates, and demos.

Packages downloaded from the PlayStation Store can be transferred to a PSP or PS3 via USB, Memory Stick, or a network connection.

A PKG file is a text file required to build an .SIS installer file, which is used to install applications on devices running the Symbian operating system (OS). It contains installation information in plain text that defines how to build the SIS installer file. PKG files typically include information about the languages supported by the application, vendor name, software dependencies, application files to copy, and details for digitally signing the file to verify its contents.

You will most likely only encounter Symbian PKG files if you are developing an application for the Symbian OS. The PKG file must be defined by Symbian developers in order to build a single distributable SIS installer file. When the application is ready to be built, developers typically use the "makesis" command, which is part of the CreateSIS utility. Developers may also use the Sisar or Easy SIS Creator applications, which provide a GUI for building SIS files. Since PKG files are saved in plain text, they can be opened and modified with a text editor, such as Microsoft Notepad or Apple TextEdit, which are bundled with Windows and macOS. If you cannot open the PKG file with a text editor, you most likely have a different type of PKG file. This is due to various file types using the .pkg file extension, which includes the macOS Installer Package and PlayStation Store Download Package formats. While SIS files are used to install applications, you can unpack the files if you want to view their contents. You can use the free UnSIS tool to unpack SIS files. NOTE: In 2010, the Symbian Foundation ended and the Symbian OS was discontinued. Nokia eventually stopped accepting software from developers in 2014.