Files with mu3 file extension can be found as audio instruments saved using Harmony and Melody Assistant.

Detailed description

Software that open mu3 file

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MU3 file extension - Harmony Assistant user instruments

What is mu3 file? How to open mu3 files?

File type specification:

Audio and sound file type icon Audio and sound file type

The mu3 file extension is typically associated with the Harmony and Melody Assistant music composing applications.

The mu3 file contains saved music notation and user instruments. User instruments use Vorbis OGG and MP3 encoding.

Updated: December 5, 2018

The default software associated to open mu3 file:

Harmony Assistant picture or screenshot

Myriad Software logoHarmony Assistant  Multiplatform software

Company or developer:
Myriad Software

Harmony Assistant is a software for computer-assisted music composition and editing. Harmony Assistant comes with its own embedded software synthesizer (SoftSynth), which provides high quality output on basic sound cards, even without any external MIDI device, and includes hundreds of different instruments.

Melody Assistant picture or screenshot

Myriad Software logoMelody Assistant  Multiplatform software

Company or developer:
Myriad Software

Melody Assistant is used to music writing, printing and rendering.

Help how to open:

Use Harmony Assistant or Melody Assistant to open *.mu3 user instruments files.

How to convert:

Possibly can be exported and converted to audio formats.

Find conversions from mu3 file:

mu3 to mp3

List of software applications associated to the .mu3 file extension

Recommended software programs are sorted by OS platform (Windows, macOS, Linux, iOS, Android etc.)
and possible program actions that can be done with the file: like open mu3 file, edit mu3 file, convert mu3 file, view mu3 file, play mu3 file etc. (if exist software for corresponding action in's database).

Click on the tab below to simply browse between the application actions, to quickly get a list of recommended software, which is able to perform the specified software action, such as opening, editing or converting mu3 files.

Software that open mu3 file - Harmony Assistant user instruments

Programs supporting the exension mu3 on the main platforms Windows, Mac, Linux or mobile. Click on the link to get more information about listed programs for open mu3 file action.


Main software associated with mu3 file by default:
Harmony Assistant
Melody Assistant

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