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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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DOTX - Extension Details
Date Added: January 02, 2009
File Extension:  .DOTX
Description 1: .DOTX file extension is linked to Word 2007 Document Template. This is the template for creating new Open XMLbased Word document or .DOCX file. It is a new file format introduced in Office 2007 version. The MS Word 2007 text editor has .DOTX as its default file format. And it is a template file which is particularly used for specifying future MS documents.
File Type:   Office 2007 Document File
Mode: Binary
Program(s) to Open:  Windows & Mac: Microsoft Word 2007 or previous versions of Word with Open XML Component support
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