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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
DC4 - Extension Details
Date Added: January 01, 1970
File Extension:  .DC4
Description 1: .DC4 file extension is linked with ViaThinkSoft [De]Coder 4 File. It is the coded file which has been encrypted with [De]Coder file encryption software developed by Daniel Marschall, with features such as multilingual support, high security and draganddrop capabilities. Users can code and decode their files using command line interface or draganddrop. .DC4 file extension and [De]Coder are owned and developed by ViaThinkSoft.
File Type:   Encoded and Encrypted File
Mode: ASCII
Program(s) to Open:  Windows: ViaThinkSoft [De]Coder
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