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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
DD - Extension Details
Date Added: January 01, 1970
File Extension:  .DD
Description 1: .DD file extension is linked with Everest Data Dictionary. This is the file extension for the data dictionary utilized by Everest Software is an awardwinning [SIIA Codie Award for Best Business Software Product] program that provides users with fullyintegrated business management solutions. It is committed to provide customers with support, service and expertise to increase their profitability and efficiency.
Description 2: .DD file extension is linked with Fuel and Petrol Tanks project data file. This is the file extension for the fuel and petrol tanks project data utilized by DDwin an application that facilitates implementation of Regulation "MIIP03: Storage of Fuel for Own Use and "MIIP04: Supply to vehicles, as well as the supporting evidence of such application. This program generates the memory and supporting annex calculations.
Description 3: .DD file extension is linked with DataFlex Data Dictionary. .DD stands for DataFlex Data_Set, which is an object which encapsulates an interface to DataFlex data file. DataFlex is a 4GL objectoriented, relational database programming language which can run programs without being recompiled and across platforms [Windows and Unix]. The strongest feature of DataFlex is its ability to be ported in various operating systems.
File Type:   Data File
Mode: ASCII
Program(s) to Open:  Windows & Unix: DataFlex
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