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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
PACKAGE - Extension Details
Date Added: January 01, 1970
File Extension:  .PACKAGE
Description 1: Another .PACKAGE file extension has to do with The Sims 2 Package file. This .PACKAGE file refers to a resource package that The Sims 2, SimCity 4 and The Sims Online use. The files contain objects, neighborhood info and characters. PACKAGE files are saved in standard DBPF archive format, the same one used by most EA games.
Description 2: .PACKAGE is an extension associated with archives that feature contents of a Linux application and associated files. This Linux Autopackage filetype is created through the Linux Autopackage package management system. The .PACKAGE files are installed or put in using the Autopackage installer software program. Use Autopackage to create application installers, not systemlevel installers.
File Type:   Compressed file
Mode: Binary
Program(s) to Open:  Unix: Autopackage
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