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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
XMCD - Extension Details
Date Added: March 03, 2009
File Extension:  .XMCD
Description 1: File extension .XMCD is tied with the Mathcad Worksheet File. These are XMLbased worksheets that Mathcad creates. Mathcad is an engineering calculation application that Parametric Technology Corporation (PTC) developed. Such files often contain both text and math elements. Mathcads original developer is Mathsoft, which is now part of the PTC firm, having been acquired sometime in 2006.
File Type:   Data file
Mode: ASCII
Program(s) to Open:  Windows: PTC Mathcad
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