1. MULTILINGUAL USER INTERFACE

2. About Multilingual User Interface
Multilingual User Interface (MUI) is a technology that provides users a localized user interface for globalized applications and user interface language resource management in the Windows operating system.

3. Functionality
On a system with MUI, each user would be able to select their own preferred display language. MUI technology was introduced with Windows 2000 and has been used in every release since (up to Windows 10). 

4. Example
Comparison of Windows Vista Ultimate Start Menu interface with an English MUI applied in the left image, and a Traditional Chinese MUI applied in the right.
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6. Features of MUI technology
Simplified language management for software localization.
An innovative resource technology based on the splitting of the application code binary from language resource files.
Complete application programming interface (API).
A set of language pack management tools that provide flexibility in international deployment image management.

7. BONUS
The most visible benefit of MUI is that multiple users can share the same workstation and view the user interface in different languages.

9. Script
Set-Culture en-GB Set-WinSystemLocale en-GB Set-WinHomeLocation -GeoId 242 Set-WinUserLanguageList en-GB
$DefaultHKEY = "HKU\DEFAULT_USER" $DefaultRegPath = "C:\Users\Default\NTUSER.DAT"reg load $DefaultHKEY $DefaultRegPath reg import "G:\SourceFiles\Scripts\RegFiles\en-gb-default.reg" reg unload $DefaultHKEY reg import "G:\SourceFiles\Scripts\RegFiles\en-gb-welcome.reg"

10. Result

11. MUI IN WINDOWS HISTORY

12. MUI in Windows 2000 and WindowsXP
MUI products for these versions were available only through volume agreements from Microsoft. They were not available through retail channels
However, some OEMs distributed the product. Up to Windows XP, MUI packs for a product are applied on top of an English version to provide a localized user experience.

13. MUI in Windows Vista
Windows Vista further advanced MUI technology with support for single, language-neutral, language-independent binary files supporting multiple language skins, with the language-specific resources contained in separate binaries. The MUI architecture separates the language resources for the user interface from the binary code of the operating system. This separation makes it possible to change languages completely without changing the core binaries of Windows Vista, or to have multiple languages installed on the same computer while using the same core binaries. Languages are applied as language packs containing the resources required to localize part of or the entire user interface in Windows Vista.

14. WINDOWS 7
Beginning with Windows 7, Microsoft started referring to MUIs as "Language Packs," although this isn't to be confused with Language Interface Packs.

15. MUI in Windows 8/8.1/RT and Windows 10
Beginning with Windows 8/RT, all editions of Windows are able to download and install all Language Packs.

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