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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:
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W3M - Extension Details
Date Added: January 01, 1970
File Extension:  .W3M
Description 1: .W3M is the extension associated with the Warcraft III Map file. It is a game map for Warcraft: Reign of Chaos that includes objects, resources and terrain that are put in the map. This file may come with the game, but players can also create it using Warcraft III World Editor. Warcraft 3 expansion pack maps bear the .W3X file extension.
File Type:   Game file
Mode: Binary
Program(s) to Open:  Mac and Windows: edit with Warcraft III World Editor, used by Blizzard Warcraft III
Common:
Extension: