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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
U3D - Extension Details
Date Added: January 01, 1970
File Extension:  .U3D
Description 1: U3D is the standard defining the semantics and syntax of the Universal 3D file format. Files with the .U3D extension contain 3D model info like textures, shading, motion data, lighting and shapes and are supported by most 3D graphics and CAD programs. The U3D file format features execution architecture that makes optimal geometry runtime modification easier, has continuousdetaillevel. It includes domainspecific compression, freeform surfaces, bonesbased animation, continuousdetail level, U3D format and runtime extensibility, domainspecific compression, freeform surfaces, keyframe, and progressive data streaming with playback.
File Type:   3D Image File
Mode: Binary
Program(s) to Open:  Mac and Windows: Acrobat 7 or Adobe Photoshop CS3, Blender, Smith Micro Poser, DAZ Studio Unix: Blender
Common:
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