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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
WAR - Extension Details
Date Added: December 02, 2009
File Extension:  .WAR
Description 1: .WAR files are compressed packages that contain Javabased web applications and components running on a web server. The WAR files are formatted similar to .JAR files, only they feature additional info that lets the application server know which particular Java servlet class to launch. Some .WAR files contain serverside utility classes like shopping carts and database beans, clientside classes that include utility classes and applets, and static web resources as sound, HTML and image files.
File Type:   Compressed file
Mode: Binary
Program(s) to Open:  Windows: BitBerry Software BitZipper, RARLAB WinRAR, Smith Micro Stuffit Deluxe 12 Macintosh: Smith Micro Stuffit Expander Unix: Tomcat Web Application Manager (within Apache), UnRAR
Common:
Extension: