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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
WM3 - Extension Details
Date Added: April 02, 2009
File Extension:  .WM3
Description 1: File extension .WM3 is associated with the VisualNastran file. The .WM3 file refers to a movie file that VisualNastran generates. MSC Nastran is described as a general purpose finite element analysis solution for use in small to complex types of assemblies. MSC Software Corporation is the company behind the development of VisualNastran.
File Type:   Movie, video, multimedia file
Mode: Binary
Program(s) to Open:  Associated application: VisualNastran
Common:
Extension: