Files that contain the .pkg file extension are most commonly used by the Apple OS X operating system. The Apple PKG files usually contain installer scripts that are used by a variety of Mac programs for software installation purposes. The PKG files contain compressed installer files that are used to install Mac software applications onto a user's hard drive.
Oftentimes PKG files will also be used to update NeXT installer packages. The PKG file format was developed to help software designers create uniform installer applications. This file format allows for the seamless and easy installation of software applications and software updates.
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