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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
OFF - Extension Details
Date Added: March 12, 2008
File Extension:  .OFF
Description 1: The .OFF file extension refers to a 3D CAD format that was originally developed by the firm Digital Equipment Corporation. The company now belongs to or is part of HewlettPackard. In the OFF format, 3D objects are defined in terms of polygons, along with other properties that describe objects and polygons.
File Type:   3D Graphics, CADCAM file
Mode: Binary
Program(s) to Open:  Associated application: RoffView from Ryan Common features in all versions: tessellates models to triangles for display; loads 3D models from files in OFF file format; displays in 3D perspective; supports direct numerical specification of viewing parameters, and mousedriven zooming, rotation and panning; displays models as shaded models, wireframes, pointfields; doublebuffered for smooth animation, supports Phong illumination model with easy manipulation of all parameters; supports separate setting of exte
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