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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
NT - Extension Details
Date Added: September 10, 2008
File Extension:  .NT
Description 1: An .NT file extension is linked to system files like AUTOEXEC.NT or CONFIG.NT. These two are loaded during Windows NTs boot process. The files contain scripts and settings that load resources needed by the Windows computer operating system. Avoid modifying, moving or deleting these files. Otherwise, users risk computer failure to start up or launch.
File Type:   System file
Mode: Binary
Program(s) to Open:  Windows: used by Windows NT, not meant to be altered or moved
Common:
Extension: