Solaris,[2] or
SunOSoperating 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&TUNIX 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.[3]
Symbian use .pkg files to store configuration information used to generate
.sis installer packages.[4]
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.[citation needed]
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.[citation needed]