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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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DOTM - Extension Details
Date Added: January 02, 2009
File Extension:  .DOTM
Description 1: .DOTM file extension is linked with Word 2007 Macroenabled Document Template. This is the template for creating new Open XMLbased Word document with .DOCM or embedded macros file. It is a new file format introduced in Office 2007 version. .DOTM are macroenabled files which have the same format as .DOCX or macrofree files, however, they have additional components that macrofree files do not possess. Open XML file formats separately store various components of different elements such as documents, graphics, charts and macros.
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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