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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
QT - Extension Details
Date Added: January 01, 1970
File Extension:  .QT
Description 1: .QT stands for QuickTime and is the file extension linked to Apple QuickTime Movie. It is the QuickTime multimedia format that Apple Computer developed. Described as crossplatform; both Windows and Macintosh systems support the QT format. QT files usually contain compressed video and audio tracks. .MOV is another common extension used to save QuickTime movie files aside from .QT.
File Type:   Movie file
Mode: Binary
Program(s) to Open:  Windows: Roxio Easy Media Creator, Apple QuickTime Player Macintosh: Roxio Toast, Apple QuickTime Player
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