.MMM File Extension

File Type:
Multiple Master Metric Data File

Having trouble opening .mmm extension? Don't panic! This page explains what mmm files are as well as suggests programs you may use to open mmm files. You can download these programs through this page.

What is a MMM file?

Mmm file extension has Multiple Master Metric Data file type, which is associated with the "data files" category.

Typically used by Multiple Master Fonts, the file includes metric data that is referenced by .PFB and .PFM files in the Windows Environment. Users should not access MMM files manually.


To learn how you can open the given file, read the information below.

mmm file icon
File Type:
Multiple Master Metric Data File
Data Files

How to open MMM file?

Double click the mmm file to open it. The file will open automatically if file associations have been correctly installed and there is a proper program on your computer; if not, file associations may be corrupted and your OS either cannot find the proper program, or you might not have one for opening the file. First, we recommend downloading our utility to fix file association errors; then, you can download any program for opening the .mmm extension from the ones suggested below. If you are certain there is nothing wrong with the file associations, you may proceed to method 2 right away; besides, if you can't make up your mind when choosing the right program, use Universal File Viewer from the last method.

Method 1: Fix file association errors

Follow these steps in order to automatically fix the mmm extension associations' problem in no time:

  • Step 1: Click on "Download Solution" to download automatic tool provided by WikiExt.
  • Step 2: Click "Start Scan" to identify all potential issues.
  • Step 3: Review scan results and click "Fix Items".

File Size: 3.04 MB, Download time: < 1 min. on DSL/ADSL/Cable

This Tool is Compatible With: Windows XP, Vista, 7, 8/8.1, 10

Method 2: Download the appropriate software

The given list provides programs which may be used for opening or converting the mmm file. Choose the proper program for your OS, and click it to start the download or proceed to the developer's website.

Programs that open MMM files

  • Windows Windows
    • Microsoft Windows Font Viewer Microsoft Windows Font Viewer

Method 3: Use universal file viewer

In addition to the list of programs above, we recommend using Universal File Viewer. This tool can open over 250 file extensions and, most likely, it will be able to open the mmm file as well. Download Universal File Viewer for your OS.

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