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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
XML - Extension Details
Date Added: April 09, 2008
File Extension:  .XML
Description 1: XML stands for Extensible Markup Language. It is a data file that utilizes tags for defining objects and any object attributes. An .XML file usually contains info that can be parsed by website browsers or used by applications installed on computers. The XML file format is good for moving data from one program to another. XML files are formatted in much the same way as .HTML documents, except they use custom tags in defining objects along with data each object contains. An XML file can be perceived as a textbased database.
File Type:   Data file
Mode: ASCII
Program(s) to Open:  Mac and Windows: Any text editor
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