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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:
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QXP - Extension Details
Date Added: March 12, 2008
File Extension:  .QXP
Description 1: .QXP is the extension for desktop publishing (or DTP) files QuarkXpress 6 and later versions created. QuarkXpress is used in creating page layouts for books, magazines, brochures, flyers, newspapers and other such publications. These files contain page layout info, images and text, and may consist of multiple pages or just one page. The .QXP extension takes the place of .QXD that was used in earlier QuarkXpress versions.
File Type:   Graphic file
Mode: Binary
Program(s) to Open:  Mac and Windows: Adobe InDesign with Q2ID Plugin, QuarkXpress
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