The File Extensions Database


.MM4 File Extension

  • Developer by: Microsoft Corporation
  • Category: Various data Files

What is an .MM4 file?

.MM4 is Microsoft Windows word processing format

The MM4 file extension is associated with the Microsoft Windows operating system for IBM-PC compatible computers and other platfrorms like ARM. The .mm4 file stores word processing format used by older versions of Windows system.


How to open:

This file type is not meant to be opened directly, there is no software that could open and work with it directly, or there is no information available in public sources about opening this file type. This is usually the case of some internal data files, caches, temporary files etc.

How to convert:

As far as we know, this .mm4 file type can't be converted to any other file format. This is usually the case of system, configuration, temporary, or data files containing data exclusive to only one software and used for its own purposes. Also some proprietary or closed file formats cannot be converted to more common file types in order to protect the intellectual property of the developer, which is for example the case of some DRM-protected multimedia files.

How to solve problems with MM4 files

  • Associate the MM4 file extension with the correct application. On :
    Windows: Right click on any MM4 file and then click "Open with" > "Choose another app". Now select another program and check the box "Always use this app to open *.MM4 files". Mac: Right click (or Ctrl-click) the MM4 file, then click "Open with" > "Other...". Then choose another program and check the "Always Open With" box. Linux: Right click on the file, and select "Open with" and choose another program. iPhone: Tap the file. If you do not see an app to open the file, then tap Share "Share" and choose an app. Alternatively, save the file. Then open the Files app Files app. There long-press on the file, then release your finger. You will see a black menu bar. Then tap "Share" and select an app. Android: Tap the Settings icon on your smartphone, then tap on the Apps section. There tap the Options icon in the top right-hand corner of the screen to change the default apps.
  • Update your software that should actually open .MM4 is Microsoft Windows word processing format. Because only the current version supports the latest MM4 file format. Search, therefore, e.g. on the Microsoft Corporation manufacturer website after an available .MM4 is Microsoft Windows word processing format update.
  • To make sure that your MM4 file is not corrupted or virus-infected, get the file again and scan it with antivirus software.