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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
NDK - Extension Details
Date Added: February 10, 2008
File Extension:  .NDK
Description 1: .NDK files are associated with the Lotus Notes Design Elements file. They contain Lotus Notes design elements that are used in creating and customizing the Interface for the Lotus users. The file "DESKTOP6.NDK includes design elements while the "CACHE.NDK stores elements that were recently used. Previous Lotus Notes versions attached the .DSK extension for the design elements files.
File Type:   Data file
Mode: ASCII
Program(s) to Open:  Windows: Domino Designer and IBM Lotus Notes
Common:
Extension: