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The File Extension Library

What is a file extension?

Short answer: it's the set of letters after the period (.) in the name of a file.

Long answer: File extensions signify the file format of a file. It tells the operating system (OS) how data was stored in the file. Not all OS, require a file extension though. For instance, this is optional in Unix, but is mandatory with MS-DOS and Windows systems.

In most file formats the file type is actually defined by the contents (first bytes, file structure), but extensions are used to define the application that is used for opening the file.

Below is a detailed database of thousands of file extensions our team has compiled for you. Feel free to browse!


Browse all Extensions:
ABCDEFGHIJKLMNOPQRSTUVWXYZ
PKG - Extension Details
Date Added: January 01, 1970
File Extension:  .PKG
Description 1: .PKG is a file extension for files containing a package of compressed installer files that are used in installing program software. The .PKG file is often used for software installations in Mac OS X. PKG files may be referenced by an installer script that comes with the software, or installed individually. Install the files by doubleclicking the package, rightclicking (Controlclick) and selecting "Show Package Contents to view files contained in the package.
File Type:   Compressed file
Mode: Binary
Program(s) to Open:  Macintosh: Mac OS X Installer (built into the operating system)
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