.MUI File Extension
File Type 1Myriad Instrument File
File format categories include Binary, Text, XML, and Zip. The format of this file type has not been determined.
Instrument file used by Myriad musical notation software products such as Harmony Assistant; stores instrument sounds and can be for piano, strings, woodwinds, brass, or a variety of other instruments; used for generating realistic sounds.
File Type 2Multilingual User Interface File
This file is saved in a binary format, which requires a specific program to read its contents.
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.
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 selectingand clicking the button.