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.pkg (package) is a filename extension used for several file formats that contain packages of software and other files to be installed onto a certain device, operating system, or filesystem, such as macOS, iOS, the PlayStation Vita, the PlayStation 3, the PlayStation 4 and the PlayStation 5.

• The macOS and iOS operating systems made by Apple use .pkg extensions for Apple software packages using the Xar format internally.

• PlayStation Vita, PlayStation 3, PlayStation 4, PlayStation 5 — used for installation of PlayStation Vita, PlayStation 3, PlayStation 4 and PlayStation 5 software, applications, homebrew, and DLC from the PlayStation Storecite-ref-1[1]

• System V Release 4 (SVR4) .pkg files are cpio archives that contain specific file tree structures.cite-ref-2[2] They are software packages that can be installed, removed and tracked using the pkgadd, pkgrm, and pkginfo commands. The SVR4-based Solaris, and the Solaris-based illumos, support that package format.cite-ref-3[3]

• Symbian use .pkg files to store configuration information used to generate .sis installer packages.cite-ref-4[4]

• BeOS used .pkg files as part of their software packaging platform. The package format was used after 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 Network.

• L3 Avionics systems use some .pkg files for software updates.

• See also

• References

• List of software package management systems

cite-note-11. ↑ ".PKG File". PSDevWiki. Retrieved 15 March 2015.

cite-note-22. ↑ citerefat-tAT&T. "SYSTEM V Application Binary Interface" (PDF). SCO Group. Retrieved 16 March 2015.

cite-note-33. ↑ citerefphilip-brownPhilip Brown. "How to make a Solaris package (pkg format)". Bolthole.com. Retrieved 11 October 2013.

cite-note-44. ↑ citerefnokia-corporationNokia Corporation. "Deploying an Application on the Symbian platform". Digia.com. Archived from the original on 2014-08-09. Retrieved 15 March 2015.