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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
QDL - Extension Details
Date Added: January 01, 1970
File Extension:  .QDL
Description 1: .QDL is the extension associated with the QDL Program. It is a program code that is written in Cue Description Language. "QDL is how others know this language. The QDL files are designed in such a way that they would be easy to parse and generate, be efficiently executable as well as humanreadable and writable.
File Type:   Text file
Mode: ASCII
Program(s) to Open:  Mac and Windows: edit with a text editor
Common:
Extension: