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The .pkg file extension is also used in the Solaris, or SunOS operating system (OS) to denote software packages that can be installed, removed and tracked using the pkgadd, pkgrm,and pkginfo commands. Solaris is currently maintained and developed by Oracle Corporation, which acquired it through its acquisition of Sun Microsystems, which originated the OS. Solaris is a derivative of the AT&T UNIX OS, and the .pkg extension was also used on AT&T UNIX System V OS.
.pkg files are built on the xar format. The contents of a .pkg file can be installed by Apple's Installer application. The .pkg file format allows easy installation of software by end users, and is commonly used by both Apple and third-party developers.
In the 90's, the .pkg file suffix was also used in BeOS. Be bought a company called StarCode and acquired their packaging tools.
During the 90's, Apple's Newton operating system also 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.
The .pkg extension is used also by PTC/CoCreate 3D Modeling application.
- "Software Delivery Legacy Guide". Retired Documents Library. 15 November 2010. Retrieved 11 October 2013.
- "Submitting to the Mac App Store". Mac Developer Library. 20 July 2011. Retrieved 11 October 2013.
- ".PKG File". FilExt. Retrieved 11 October 2013.
- Philip Brown. "How to make a Solaris package (pkg format)". Bolthole.com. Retrieved 11 October 2013.
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