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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
DOT - Extension Details
Date Added: January 01, 1970
File Extension:  .DOT
Description 1: .DOT file extension is linked with Graphviz DOT Language File. This is the file extension for the language file utilized by Graphviz an old family of graph processing tools. .DOT file extension became problematic since MS Word is using the same file extension. With this issue, other graph tools emerged such as GUIs and networked graph applications.
Description 2: .DOT file extension is linked with Ribbons Molecular Surface File. This is the file extension for the molecular surface file utilized by Ribbons a popular molecular graphics program designed to display rendered images of molecular models. Atomic coordinates in PDB format and color coding information consists its requisite data. This program runs on Evans & Sutherland ESV and SGI workstations. Ribbons is owned and developed by Dr. Mike Carson of the University of Alabama at Birmingham.
File Type:   Data file
Mode: ASCII
Program(s) to Open:  Windows: Ribbons
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