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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
WIDGET - Extension Details
Date Added: January 01, 1970
File Extension:  .WIDGET
Description 1: File extension .WIDGET is associated with a small program called a "widget that the Yahoo! Widget Engine runs. Users use the Widget engine software service to run and display desktop widgets on desktops. Desktop widgets are applets that are physically inspired, providing access to info along with frequently used functions like calendars, clocks and news aggregators. Widget files often have the extension .WIDGET attached.
File Type:   Executable file
Mode: Binary
Program(s) to Open:  Mac and Windows: Yahoo! Widget Engine
Common:
Extension: