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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
DOC - Extension Details
Date Added: July 12, 2008
File Extension:  .DOC
Description 1: .DOC file extension is linked with Document File. Generally, formatted text documents utilize .DOC file extension. The widelyknown application that uses .DOC file extension is Microsoft Word; however, it is also used by other programs such as Total Word, SmartWare, Sprint, Want IWP, WordStar, Volkswriter and WordMarc. .DOC file extension is also associated with the following applications: Adobe FrameMaker, FrameBuilder, Microsoft Write, Ashampoo Office, OpenOffice.org and Microsoft WordPad.
Description 2: .DOC file extension is linked with Microsoft Word Document. Microsoft Word is the most popular word processing program in the market. It is included in all versions of Microsoft Office. It may carry formatted texts, tables, images, charts, graphs, print settings and page formatting. .DOC file opens directly and it is a proprietary format utilized by Microsoft software.
File Type:   Document File
Mode: Binary
Program(s) to Open:  Windows: Microsoft Word or Word Viewer, Nuance OmniPage Professional, OpenOffice.org Writer; Mac: Apple Pages or AppleWorks, Microsoft Word, Nuance OmniPage Pro X, OpenOffice.org Writer
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