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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
XX - Extension Details
Date Added: January 01, 1970
File Extension:  .XX
Description 1: .XX files are 7bit ASCII text files that have been encoded using XX encoding (or XXEncoding). This is an encoding method that utilizes only alphanumeric characters, along with the plus and minus signs. Originally developed to provide a means for transferring files without corrupting them and similar to UUEncoded (.UU) files, the XXEncoding format is seldom used today. Most applications now feature support for binary file transfers, no longer needing files to be encoded to be able to move them. XXEncoded files sometimes use the .XXE extension.
File Type:   Compressed file
Mode: ASCII
Program(s) to Open:  Windows: Corel WinZip, PicoZiP, PowerArchiver
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