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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
PAK - Extension Details
Date Added: January 01, 1970
File Extension:  .PAK
Description 1: .PAK is an extension referring to the compressed archive file format deriving from DOS that is able to house many files. A PAK file allows for compression, but it can also be uncompressed. For the most part, PAK files are compressed using the ZLIB compression. Data loaded by videogames like Half Life, Hexen and Quake are commonly stored using PAK files. Such files may contain textures, graphics, sounds, objects and other game data that are "packed or crammed into one file.
File Type:   Compressed file
Mode: Binary
Program(s) to Open:  Windows: Astonsoft Archivarius, Leinen Pak Explorer, Smith Micro Stuffit Deluxe, VCOM PowerDesk Pro, WinZip 12 Pro Macintosh: Smith Micro Stuffit Expander
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