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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
X3F - Extension Details
Date Added: December 03, 2009
File Extension:  .X3F
Description 1: File extension .X3F is linked to Sigma Camera RAW Picture File. Download and manipulate photos using the SIGMA Photo Pro program software that comes with the camera. The Foveon X3 direct image sensor is capable of capturing all three colors at each pixel location. Special software is required to manipulate RAW files. Cameras with the Foveon sensor will have no difficulty saving and using the .X3F format.
File Type:   Graphic file
Mode: Binary
Program(s) to Open:  Open with Sigma Camera RAW Picture File program Associated link: Foveon
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