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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
QTCH - Extension Details
Date Added: January 01, 1970
File Extension:  .QTCH
Description 1: The .QTCH file extension is tied up with the QuickTime Cache files. It refers to the cache of QuickTime video and audio files streamed or downloaded from the Net. Files created by QuickTime 6.5 or older versions can be opened using QuickTime Player. Simply change the file extension so it matches the original files like .MOV, MP3 or .MPEG. QuickTime 7 and up models scramble QTCH files header info so it is impossible to play them back by just altering the file extension.
File Type:   Audio/Video file
Mode: Binary
Program(s) to Open:  Mac and Windows: iTunes or Apple QuickTime Player
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