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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:
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QTZ - Extension Details
Date Added: January 01, 1970
File Extension:  .QTZ
Description 1: Animation generated via Quartz Composer has the .QTZ file extension attached. Quartz Composer is Apples development utility for processing as well as rendering graphical data. These files usually include 3D objects, MIDI data, 2D images, audio, and even 3D and 2D effects. QTZ files are seen used for a number of Macintosh OS X screensavers like Spectrum.qtz and RSS Visualizer.qtz, which are saved in the directory marked /System/Library/Screen Savers/. The Quartz Composer comes installed with the Apple Developer Tools and is saved under the /Directory/Applications/ directory.
File Type:   Video file
Mode: Binary
Program(s) to Open:  Mac: Apple Quartz Composer, Viewable with Apple QuickTime Player
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