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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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XMCDZ - Extension Details
Date Added: March 03, 2009
File Extension:  .XMCDZ
Description 1: .XMCDZ is a file extension linked to Mathcad Compressed Worksheet File. These are XMLbased worksheets that Mathcad created. Mathcad refers to an application used to generate scientific and engineering calculations. An .XMCDZ file often includes both textual and mathematical elements. The .XMCDZ files are similar to .XMCD files, only the former are saved in compressed format.
File Type:   Compressed file
Mode: Binary
Program(s) to Open:  Windows: PTC Mathcad
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