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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
3DMF - Extension Details
Date Added: January 04, 2009
File Extension:  .3DMF
Description 1: File extension .3DMF is linked to the QuickDraw 3D Metafile. It refers to a threedimensional image format that is based on the Apple QuickDraw (QD3D for short) technology. The .3DMF files may be 3D representations of individual objects. A .3DMF file may also make up a complete or an entire threedimensional scene.
File Type:   3D Image file
Mode: Binary
Program(s) to Open:  Windows: Apple QuickTime Player, Pedagoguery Poly Pro Macintosh: AlphaOmega 3DMF Viewer, Apple QuickTime Player, DCAD VectorSpace, Lundstrom Design TouchCAD
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