If you are seeking information about file extensions, then you are in the right place at right time.

Details of extension .3mm

1 extension(s) and 0 alias(es) in our database

Below, you can find answers to the following questions:

  • What is the .3mm file?
  • Which program can create the .3mm file?
  • Where can you find a description of the .3mm format?
  • What can convert .3mm files to a different format?
  • Which MIME-type is associated with the .3mm extension?
3D Movie Maker Project .3mm file icon

3D Movie Maker Project

The 3MM file is a 3D Movie Maker Project. 3D Movie Maker is a program created by Microsoft's "Microsoft Kids" subsidiary in 1995.
Category: Multimedia files
Application: 3D Movie Maker
Program name: -
Mime-type: application/octet-stream
Magic bytes (HEX): -
Magic string (ASCII): -
Related extensions:
.nmm 3D Movie Maker Recorded Video
.3th 3D Movie Maker Thumbnail Data
.chk 3D Movie Maker Interface Data
.3cn 3D Movie Maker Scene Data
.vmm 3D Movie Maker Video

Other types of files may also use the .3mm file extension. If you have helpful information about .3mm extension, write to us!

Is it possible that the filename extension is misspelled?

We found the following similar extensions in our database:

.mm NeXtMidas Macro
.emm MindMaple Map Document
.rmm RAM Metafile
.3ml SimStudio 3D Model
.wmm World Magnetic Model Data
.3m Advent 3B2 Macro

The .3mm filename extension is often given incorrectly!

According to the searches on our site, these misspellings were the most common in the past year:

wmm (1), mm (1), 3ml (1), rmm (1), emm (1), 3m (1)

Can't open a .3mm file?

If you want to open a .3mm file on your computer, you just need to have the appropriate program installed. If the .3mm association isn't set correctly, you may receive the following error message:

Windows can't open this file:

File: example.3mm

To open this file, Windows needs to know what program you want to use to open it. Windows can go online to look it up automatically, or you can manually select from a list of programs that are installed on your computer.

To change file associations:

  • Right-click a file with the extension whose association you want to change, and then click Open With.
  • In the Open With dialog box, click the program whith which you want the file to open, or click Browse to locate the program that you want.
  • Select the Always use the selected program to open this kind of file check box.

Supported operating systems

Windows Server 2016/2019/2022, Windows 7, Windows 8, Windows 10, Windows 11, Linux, Mac OS X, macOS, iOS, Android