A daily updated filename extension database!

3MM file extension

The table below provides useful information about the .3mm file extension. It answers questions such as:

  • What is the .3mm file?
  • What program do I need to open a .3mm file?
  • How can the .3mm file be opened, edited or printed?
  • How can I convert .3mm files to another format?

Table of Contents

We hope you find this page helpful and a valuable resource!

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

✅ 3D Movie Maker Project

3D Movie Maker Project .3mm file icon
3MM file is a 3D Movie Maker Project. 3D Movie Maker is a program created by Microsoft's "Microsoft Kids" subsidiary in 1995.
3MM format description not yet available
Category: Multimedia files
Application: 3D Movie Maker
Mime-type: application/octet-stream
Magic number: -
Magic string: -
Sample: -
3MM aliases:
3MM related links:
3MM related extensions:
3D Movie Maker Video

3D Movie Maker Scene Data

3D Movie Maker Thumbnail Data

Other types of files may also use the .3mm file extension.

🚫 The .3mm file extension is often given incorrectly!

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

3ml, emm, mm, rmm, wmm

Is it possible that the filename extension is misspelled?

We found the following similar file extensions in our database:

Street Fighter IV Model
Matrix Market File
FreeMind MindMap
Transport Fever Game Cache Data
SimStudio 3D Model
RAM Metafile
EARS Mail Merge Definition
World Magnetic Model Data

🔴 Can't open a .3mm file?

When you double-click a file to open it, Windows examines the filename extension. If Windows recognizes the filename extension, it opens the file in the program that is associated with that filename extension. When Windows does not recognize a filename extension, you receive the following message:

Windows cannot open this file:


To open this file, Windows needs to know what program you want to use to open it...

If you don't know how to set the .3mm file association, check the FAQ.

🔴 Can I change the extension of files?

Changing the filename extension of a file is not a good idea. When you change a file's extension, you change the way programs on your computer read the file. The problem is, changing the file extension does not change the file format.

If you have helpful information about the .3mm file extension, write to us!

Browser: Abbreviation Application Archive Audio Configuration Data Development Disk Image Document Ebook Font Game Data GIS Graphic Malware Multimedia Other Project Scam Unknown Video
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