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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
XSN - Extension Details
Date Added: April 02, 2009
File Extension:  .XSN
Description 1: File extension .XSN is associated with the Microsoft Office InfoPath template form file. A template file format refers to a format whose file extension suggests a type of file that is meant to be a takeoff or starting point from which other files can be created. Adobe® LiveCycle® Designer and Microsoft Office InfoPath are two applications linked to the .XSN file format.
File Type:   Office 2007 Document file
Mode: Binary
Program(s) to Open:  Associated applications: Adobe LiveCycle Designer, Microsoft Office InfoPath
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