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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
AAO - Extension Details
Date Added: January 01, 1970
File Extension:  .AAO
Description 1: .AAO file extension is linked with America's Army map file. America's Army is one of the most popular computer action games that is played online. The game offers with highly authentic military experience that can range from soldier's training as an individual and platoon trainings as a group, to simulated deployment missions in the War on Terror. .AAO file extension and America's Army [the game] is owned and developed by America's Army [the game developer].
File Type:   Game File
Mode: Binary
Program(s) to Open:  Windows & Mac: America's Army
Common:
Extension: