Opening MMD Files

The MMD file type is primarily associated with Mermaid.js.

MMD	File extension: MMD
	File type:	multi-purpose data file

What is an MMD file

MMD files mostly belong to Mermaid.js. MMD files can be very different depending on the program that creates or uses them.
For example, some MMD files are Mermaid Markup Diagrams. In these files you write plain text that defines sequence diagrams, flowcharts, UML class diagrams, or entity relationship diagrams. These files are processed by tools like Mermaid.js to produce visual diagrams.
Other MMD files come from the world of 3D animation – they are used by programs such as MikuMikuDance. In that case the file can store 3D model data, animation instructions, measurement data, or even MIDI music information that syncs with the animation.
Additional uses include:

MemoImage Bitmap: A raster image format used for mobile phone skins.

Mind Map Diagrams: Files created by mind mapping software like FreeMind or MindMaster.

Other Data Files: Some contain information like machine tool data, SQLite databases, or even specialized markup for class or entity diagrams.

FilExt.com tip: Because the MMD extension is shared by several different file types, you should check the file’s contents – for instance by opening it in a text editor – to see if it contains readable diagram markup or binary data. This clue will help you decide whether to use a diagram viewer (like Mermaid.js) or a 3D animation tool (like MikuMikuDance) to open the file.

How do you open MMD files?

You need a suitable software like Mermaid.js to open an MMD file. Without proper software you will receive a Windows message "How do you want to open this file?" or "Windows cannot open this file" or a similar Mac/iPhone/Android alert. If you cannot open your MMD file correctly, try to right-click or long-press the file. Then click "Open with" and choose an application. You can also display a MMD file directly in the browser:. Just drag the file onto this browser window and drop it.

Online MMD Text Viewer

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Programs that open and convert MMD files:

Mermaid.js
See the previous paragraphs to learn more about the main application. MMD files are often referred to as Mermaid.js miscs because this type of file is primarily created or used by this software.
Cumulate Draw (Editable MMD Format) by Cumulate Labs
On-line drawing tool. Cumulate Draw is distributed under Mozilla Public License Version 1.1. Diagrams created in Firefox are saved in .FMD format, while those created in IE are saved in .MMD format. Currently, you cannot open a .MMD diagram in Firefox and vice versa. The identifying characters used for this association are - Hex: 3C 3F 78 6D 6C 3A, ASCII: .?xml:. This file format is classified as Graphic.
DocsAlive (Multimedia Document) by Softedge-Systems Ltd
DocsAlive is an all-in-one multimedia content creation software product, which allows the user to create video, audio, animation, text, drawing, and pictures in one document. Related links: DocsAlive Free Player
MacroModel Molecular Mechanics File by Columbia University Chemistry
The Mime types used with this association are: chemical/x-macromodel-input.
mAirList (Metadata) by Torben Weibert
mAirList is radio automation software for Windows 98/ME/2000/XP/2003/Vista, designed for the small but professional radio station. A mAirList Metadata file (.MMD) contains metadata about a single audio file, such as artist and title, cue point settings, ending type, and any user defined data fields.
MangoData (Multi-User Database) by MightyMango
MangoData is a multi-user database for education. It allows pupils to create a database, enter information and then search the data to display results through a range of graphs. This file format is classified as Database.
Media Processing Server Studio (Data) by Nortel Networks
Media Processing Server Studio is a graphical software tool that is used to create, edit, and manage audio elements of menu prompts in both the Voice Processing Series (VPS) and Media Processing Server (MPS) environments. This product used to be known as Peristudio/PeriProducer. Extensions used by it for IVR vocabulary file manipulation include .MMI=Index, .MMD=Data, and .MMF=Reference Name.
Nigarva Downloader (Download List File) by K&A Corporation
Stores download list and special data. The Nigarva Downloader MMD files have 3 versions (as of 23 Sept 2003): 1.0 - Links + Download Name only; 2.0 - Links + Download Name + Referer; 3.0 - Links + Download Name + Referer + Cookie + CookieOrigin This file format is classified as Text.
Summit Membership Manager (Database) by MIE Software Pty Ltd
This file format is classified as Database.

MMD file format:

If you can determine the file format, the associated program can also be determined. The first characters in a file identify the file format, for example, HTML files start with the bytes <html>. Nonetheless, different programs can utilize the same file extension to represent distinct file formats. Double-clicking on the file often results in an error when opening. Knowledge is power - this also applies when dealing with unknown or faulty files. Below is our analysis of the MMD files:

The MMD extension is quite commonly used. The file itself is used by different programs with different formats. The two most popular formats are as follows:

30% of all MMD files use the same file format, which have the signature MemoImage Bitmap,0,767E050078. If you open these files in a text editor, you can view and read the content yourself. The files are 3 KB to 16 KB in size, with a median of 4 KB. The file type is a fairly new file format. Certain words are almost always found in the files, such as MemoImage Bitmap. Files like these have the following tags: iphone, oppo, plus, apple, realme, huawei, back and note.
6% of all MMD files use the same file format, which have the signature sequenceDiagram. These files are plain text, which means they can be viewed with any text editor such as Windows Editor, Nano for Linux, and TextEdit for macOS. The files are on average 1 KB in size and range from 460 bytes to 1 KB. The files contain the following words: sequenceDiagram and participant. Such files are related to sequence, diagram and flow.

All other MMD files (64%) have no consistent format, often e.g. Madonna Model, JSON, JetDB, SQL, graph, TITLE, MMD, Min, models and classDiagram. Often described as model, equations, oneplus, samsung, front, redmi, code, lite or mill. If you want to find out which format your MMD file belongs to, just click on the button "Choose your .mmd file to analyze".

Technical Data for MMD File Extension

File classification:

Misc

Identifier:

Hex: 3C 3F 78 6D 6C 3A, ASCII: .?xml: (provided by TrID database)

Related files:

pmd, vmd, mm, mdl, mmdb, mcam-mmd, pmx, mmd-journal, zip, pmm, mcam-control, t3d, png, mvd, plt, bmp, rar, e3d, fiz, jpg, exe, md, mmi, fmd, sql, json

Mime type:

application/vnd.chipnuts.karaoke-mmd

The following listing is compiled from the database produced by the 'Associate This!' program, selected data from the main FILExt database and file extension information submitted by users.

ProgramID: MXmmd
EXEFile: %ProgramFiles%\mfw\exec\moss.exe %1

an mmd multi-purpose data file is a special file format and should only be edited and saved with the appropriate software.

How to solve problems with MMD files

Associate the MMD file extension with the correct application.
Update your software that should actually open multi-purpose data files. Because only the current version supports the latest MMD file format. Search, therefore, e.g. on the manufacturer website after an available Mermaid.js update.
To make sure that your MMD file is not corrupted or virus-infected, get the file again and scan it with Google's virustotal.com.
Click here to open your .MMD file online - secure, fast, and no downloads needed.