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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
BAT - Extension Details
Date Added: August 01, 2009
File Extension:  .BAT
Description 1: .BAT file extension is linked with DOS Batch File. This file contains a series of commands that might have been entered at the DOS command prompt. This is also commonly used to run utility applications and to start programs within Windows. .BAT files can be generated manually and can also be edited to automate other tasks and to perform repetitive commands. This file can be written using basic text editor such as Notepad and then saved with .BAT file extension.
File Type:   Program Executable File
Mode: Binary
Program(s) to Open:  Windows: Can be edited using a text editor, runs itself; Mac: Parallels Desktop with Windows
Common:
Extension: