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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
QXD - Extension Details
Date Added: March 12, 2008
File Extension:  .QXD
Description 1: .QXD stands for QuarkXpress Document. It is a desktop publishing file that QuarkXpress 5 (or earlier) created that is occasionally written as "QuarkXpress. This filetype is used to create page layouts for newspapers, flyers, magazines, brochures, books as well as other publications. The .QXP extension replaced .QXD in QuarkXpress versions 6 and up.
File Type:   Page Layout file
Mode: Binary
Program(s) to Open:  Mac and Windows: Adobe InDesign with Q2ID Plugin, QuarkXpress
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