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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
A78 - Extension Details
Date Added: January 01, 1970
File Extension:  .A78
Description 1: .A78 file extension is linked with Atari 7800 Image File. This is the file extension for the image file utilized by Atari 7800 a video game console which was designed and released by Atari to replace Atari 5200. Atari 7800 features include: simple digital joysticks, affordable and nearly fully backwardcompatible with Atari 2600. .A78 file extension and Atari 7800 are owned and developed by AtariAge.
File Type:   Game File
Mode: Binary
Program(s) to Open:  Windows: Atari 7800
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