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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
ADD - Extension Details
Date Added: January 01, 1970
File Extension:  .ADD
Description 1: .ADD file extension is linked with Advantage Database Server Data File. This is the file extension for the data file utilized by Advantage Database Server a fullfeatured, highperformance client/server data management system. This application is specificallydesigned for ISVs [Independent Software Vendors], small and mediumsized businesses, and commercial software application developers that are looking for potent, easilyintegrated and easilymanaged database solution. Advanced Database Server is owned and developed by Sysbase Inc.
File Type:   Database File
Mode: Binary
Program(s) to Open:  Windows: Advantage Database Server
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