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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
NEF - Extension Details
Date Added: September 09, 2008
File Extension:  .NEF
Description 1: .NEF is the file extension tied to raw photos that a Nikon digital camera captures. It is the uncompressed format used for storing data exactly as they were taken by the CCD. Users can make adjustments to stuff like white balance and exposure with the help of related software once images are saved onto a PC.
File Type:   Image file
Mode: Binary
Program(s) to Open:  Windows: Nikon View, ACDSee Photo Manager Macintosh: iPhoto 5 or later, Apple Aperture, Adobe Photoshop CS, Nikon View
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