A 3D Movie is a computer file

Computer file

A computer file is a block of arbitrary information, or resource for storing information, which is available to a computer program and is usually based on some kind of durable storage. A file is durable in the sense that it remains available for programs to use after the current program has finished...

 for a digital movie

Film

A film, also called a movie or motion picture, is a series of still or moving images. It is produced by recording photographic images with cameras, or by creating images using animation techniques or visual effects...

 that uses Microsoft

Microsoft

Microsoft Corporation is an American public multinational corporation headquartered in Redmond, Washington, USA that develops, manufactures, licenses, and supports a wide range of products and services predominantly related to computing through its various product divisions...

 3D Movie Maker

3D Movie Maker

3D Movie Maker is a program created by Microsoft's "Microsoft Kids" subsidiary in 1995. Using this program, directors are able to place 3D characters in pre-made or custom-made environments, add actions, sound effects, music, text, and speech, and then show these movies off to friends, family,...

, or any of its expansions, such as Doraemon 3DMM, Nickelodeon 3DMM, and v3DMM. 3D Movies can only be viewed in these products, and the creative of AVI

Audio Video Interleave

Audio Video Interleave , known by its acronym AVI, is a multimedia container format introduced by Microsoft in November 1992 as part of its Video for Windows technology. AVI files can contain both audio and video data in a file container that allows synchronous audio-with-video playback...

 or MPEG files from theme requires third-party software.

The two common file format

File format

A file format is a particular way that information is encoded for storage in a computer file.Since a disk drive, or indeed any computer storage, can store only bits, the computer must have some way of converting information to 0s and 1s and vice-versa. There are different kinds of formats for...

s used by 3D Movies are .3mm and .vmm. .nmm was a third file format once used by 3D Movies, but since the release of the "Nickelodeon 3DMM" add-on to 3D Movie Maker, which combined both editions in one program, this has been deprecated by the ".3mm" file format.