.MUI File Extension

.MUI File Extension

File Type 1

Myriad User Instrument File

Developer Myriad Software
4.1  |  448 Votes
Category Audio Files
Format N/A

What is a MUI file?

An MUI file is a user instrument file used by Myriad musical notation software products such as Harmony Assistant. It stores sounds for a variety of instruments such as piano, strings, woodwinds, brass. MUI files are used for generating realistic sounds.

More Information
Screenshot of a .mui file in Myriad Harmony Assistant
MUI file open in Myriad Harmony Assistant

There are many default instruments that come with Harmony Assistant. The instruments consist of a recording of an instrument playing a specific note and parameters to tell the program how it should be played. The MUI file allows users to create instruments other than the default ones by editing an instrument and selecting "Save predefined instrument" in the "Action" contextual menu. The user can also define the parameters of the instruments such as the note range, sound attack rate, decay, volume release, and loop release.

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Programs that open MUI files

Updated April 13, 2017
File Type 2

Multilingual User Interface File

Developer Microsoft
4.0  |  237 Votes
Category System Files
Format Binary

What is a MUI file?

Resource file used by the Multilingual User Interface component of Windows 2000 and later; contains resources that allow the Windows interface to be changed to different languages.

More Information

Many MUI files can be found within the Windows %SystemRoot%\ directory (e.g., %SystemRoot%\en-US\ in Windows 7). They may also be located within specific program installations, such as Windows Journal, Windows Defender, Windows Mail, and other Microsoft Windows programs, including Notepad (notepad.exe.mui).

Additional language packs can be installed in Windows 7 by selecting Control Panel → Clock, Language, and Region → Change display language → Keyboards and Languages and clicking the Install/uninstall languages... button.

Programs that open or reference MUI files

Updated July 1, 2010

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