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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
TAR - Extension Details
Date Added: January 01, 1970
File Extension:  .TAR
Description 1: File extension .TAR refers to the format containing multiple files that are stored as a single archive. Created using the Unix TAR program, TAR files are not compressed automatically. They are usually compressed with GnuZip, creating a .GZ file. A filename ending in .tar.gz indicates a TAR archive that underwent Gnu Zip compression. The shortened .TGZ file extension is also sometimes used.
File Type:   Archive/Compressed file
Mode: Binary
Program(s) to Open:  Windows: ALTools AlZip, 7Zip, Corel WinZip, Smith Micro Stuffit Deluxe, PicoZIP, Zipeg, WinACE Macintosh: Zipeg, Smith Micro Stuffit Expander Unix: tar
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