What is MUI? MUI, short name for Multilingual User Interface, is used as the file extension for Multilingual User Interface files. .MUI files are used to help a single application to be installed with multiple interface languages on a single system. See the sample .MUI file included below.

File Extension: .MUI

MIME Type: application/octet-stream

File Content: Multilingual User Interface

.MUI files are Multilingual User Interface files, which contains user interface text information for specific languages. Here are the first 128 bytes of a sample .MUI, tipresx.dll.mui, dumped in HEX values:

4d 5a 90 00 03 00 00 00 04 00 00 00 ff ff 00 00 MZ..............
b8 00 00 00 00 00 00 00 40 00 00 00 00 00 00 00 ................
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
00 00 00 00 00 00 00 00 00 00 00 00 b8 00 00 00 ................
0e 1f ba 0e 00 b4 09 cd 21 b8 01 4c cd 21 54 68 ...........L..Th
69 73 20 70 72 6f 67 72 61 6d 20 63 61 6e 6e 6f is.program.canno
74 20 62 65 20 72 75 6e 20 69 6e 20 44 4f 53 20 t.be.run.in.DOS.
6d 6f 64 65 2e 0d 0d 0a 24 00 00 00 00 00 00 00 mode............

.MUI Multilingual User Interface File file sample: Click sample.mui to download.

.MUI files are usually provided with multiple versions: one version per language. For example, on a Windows 7 system, there are 35 versions of tipresx.dll.mui:

\Program Files\Common Files\microsoft shared\ink\ar-SA\tipresx.dll.mui
\Program Files\Common Files\microsoft shared\ink\bg-BG\tipresx.dll.mui
\Program Files\Common Files\microsoft shared\ink\cs-CZ\tipresx.dll.mui
\Program Files\Common Files\microsoft shared\ink\da-DK\tipresx.dll.mui
\Program Files\Common Files\microsoft shared\ink\de-DE\tipresx.dll.mui
\Program Files\Common Files\microsoft shared\ink\el-GR\tipresx.dll.mui
\Program Files\Common Files\microsoft shared\ink\en-US\tipresx.dll.mui
\Program Files\Common Files\microsoft shared\ink\es-ES\tipresx.dll.mui
\Program Files\Common Files\microsoft shared\ink\et-EE\tipresx.dll.mui
\Program Files\Common Files\microsoft shared\ink\fi-FI\tipresx.dll.mui
\Program Files\Common Files\microsoft shared\ink\fr-FR\tipresx.dll.mui
\Program Files\Common Files\microsoft shared\ink\he-IL\tipresx.dll.mui
\Program Files\Common Files\microsoft shared\ink\hr-HR\tipresx.dll.mui
\Program Files\Common Files\microsoft shared\ink\hu-HU\tipresx.dll.mui
\Program Files\Common Files\microsoft shared\ink\it-IT\tipresx.dll.mui
\Program Files\Common Files\microsoft shared\ink\ja-JP\tipresx.dll.mui
\Program Files\Common Files\microsoft shared\ink\ko-KR\tipresx.dll.mui
\Program Files\Common Files\microsoft shared\ink\lt-LT\tipresx.dll.mui
\Program Files\Common Files\microsoft shared\ink\lv-LV\tipresx.dll.mui
\Program Files\Common Files\microsoft shared\ink\nb-NO\tipresx.dll.mui
\Program Files\Common Files\microsoft shared\ink\nl-NL\tipresx.dll.mui
\Program Files\Common Files\microsoft shared\ink\pl-PL\tipresx.dll.mui
\Program Files\Common Files\microsoft shared\ink\pt-BR\tipresx.dll.mui
\Program Files\Common Files\microsoft shared\ink\pt-PT\tipresx.dll.mui
\Program Files\Common Files\microsoft shared\ink\ro-RO\tipresx.dll.mui
\Program Files\Common Files\microsoft shared\ink\ru-RU\tipresx.dll.mui
\Program Files\Common Files\microsoft shared\ink\sk-SK\tipresx.dll.mui
\Program Files\Common Files\microsoft shared\ink\sl-SI\tipresx.dll.mui
\Program Files\Common Files\microsoft shared\ink\sr-Latn-CS\tipresx.dll.mui
\Program Files\Common Files\microsoft shared\ink\sv-SE\tipresx.dll.mui
\Program Files\Common Files\microsoft shared\ink\th-TH\tipresx.dll.mui
\Program Files\Common Files\microsoft shared\ink\tr-TR\tipresx.dll.mui
\Program Files\Common Files\microsoft shared\ink\uk-UA\tipresx.dll.mui
\Program Files\Common Files\microsoft shared\ink\zh-CN\tipresx.dll.mui
\Program Files\Common Files\microsoft shared\ink\zh-TW\tipresx.dll.mui