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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
AAP - Extension Details
Date Added: January 01, 1970
File Extension:  .AAP
Description 1: .AAP file extension is linked with Apollo Advanced Playlist a type of Windows audio player which started out as an MP3 player. .AAP always has a section on this playlist and it is the only version of the file extension format. Apollo offers highdefinition MP3 coding, continuous playback support and advanced playlist features. .AAP and Apollo Advanced Playlist are owned by Heikki Ylinen.
File Type:   Audio/Music File
Mode: Binary
Program(s) to Open:  Apollo Advanced Playlis
Common:
Extension: