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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
QTX - Extension Details
Date Added: January 01, 1970
File Extension:  .QTX
Description 1: The file extension .QTX is short for QuickTime Extension. It refers to a component that Apple QuickTime Player uses, enabling support for additional file formats and video codecs. QTX files make playing video files that are encoded using thirdparty codecs possible. In order for QuickTime to recognize QTX files and work right, the files need to be installed or placed in the correct folder. QuickTime early versions for Windows store the QTX files under "C:Program FilesQuickTimeQTComponents. QuickTime 7 for Windows PCs keeps QTX files within the "C:Windowssystem32 directory. For Mac systems, QTX files are kept in the "/Library/Quicktime/ folder.
File Type:   Plugin file
Mode: ASCII
Program(s) to Open:  Mac and Windows: referenced by Apple QuickTime Player
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