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Sony Computer Entertainment,
- The macOS and iOS operating systems made by Apple use .pkg extensions for Apple software packages.
- Sony PlayStation 3, Sony PlayStation 4 - Used for installation of PlayStation 3 and PlayStation 4 software, applications, homebrew, and DLC from the PlayStation Store
- Solaris, or SunOS operating system (OS) and illumos - Denotes software packages that can be installed, removed and tracked using the pkgadd, pkgrm,and pkginfo commands. Solaris is a derivative of the AT&T UNIX OS, and the .pkg extension was also used on AT&T UNIX System V OS.
- AT&T UNIX System V .pkg files are cpio archives that contain specific file tree structures.
- Symbian use .pkg files to store configuration information used to generate .sis installer packages.
- BeOS Used .pkg files in the 90's as part of their software package platform. Be Inc. bought Starcode Software Inc. and acquired their packaging tools.
- Apple Newton operating system used files ending in .pkg for Newton applications and software. As a result, when seen from the Mac OS X Finder, Newton applications appear the same as Mac OS X Installer packages, however they do not share their file format.
- PTC/CoCreate 3D Modeling application use .pkg files to store model files. This .pkg file uses the zip file format.
- Microsoft is said to use .pkg files for profile storage on Xbox Live.
- L3 Avionics systems use some .pkg files for software updates.
- ".PKG File". PSDevWiki. Retrieved 15 March 2015.
- Philip Brown. "How to make a Solaris package (pkg format)". Bolthole.com. Retrieved 11 October 2013.
- AT&T. "SYSTEM V Application Binary Interface" (PDF). SCO Group. Retrieved 16 March 2015.
- Nokia Corporation. "Deploying an Application on the Symbian platform". Digia.com. Retrieved 15 March 2015.