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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
NS4 - Extension Details
Date Added: June 02, 2009
File Extension:  .NS4
Description 1: File extension .NS4 is associated with a database file that Lotus Notes 4.x creates. NS4 files usually contain email messages, a calendar, and a contacts list, along with other info. Users can likewise utilize the Notes application program for instant messaging. Notes 4.5 and the Domino Notes server program were released in 1996. Most of the succeeding updates were only available for Windows. End of 2006 saw the release of Lotus Notes 7.0.2 for Mac OS X systems.
Description 2: .NS4 is the extension tied to Lotus Notes 4.x database file. There are email messages, a calendar, text notes, contacts list along with other info in a .NS4 file. An additional use for this Notes application is for instant messaging. The Notes server program "Domino was released sometime in 1996 together with Notes 4.5. Most of the updates that followed were only released for the Windows system. It was only by end of 2006 that Lotus Notes 7.0.2 for Mac OS X was introduced.
File Type:   Data file
Mode: ASCII
Program(s) to Open:  Mac and Windows: IBM Lotus Notes 2 or later, Lotus Domino
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