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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
QTR - Extension Details
Date Added: January 01, 1970
File Extension:  .QTR
Description 1: .QTR is a file extension linked to the QuickTime Extension Resource. A QuickTime extension like .QTX that is known for providing support for additional video codecs, references this resource file. Use the .QTR file to store the resource fork containing Macintoshstyle resources. Combining QTX with QTR files to form a single QTX file is possible with the help of the Apple QuickTime Rezwack tool.
File Type:   Plugin file
Mode: ASCII
Program(s) to Open:  Mac and Windows: referenced by Apple QuickTime Player
Common:
Extension: