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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
ZZ - Extension Details
Date Added: January 01, 1970
File Extension:  .ZZ
Description 1: The .ZZ extension is tied with the Zzip Compressed Archive. It is a Zzipcompressed file archive. Zzip is a compression tool for both Unix and Windows using a compression algorithm that is primarily based on the BurrowsWheeler Transform method. .ZZ files feature support for file integrity tests as well as builtin multimedia compression and detection.
File Type:   Compressed file
Mode: Binary
Program(s) to Open:  Windows and Unix: Zzip
Common:
Extension: