UILanguageFallback specifies the language to use for resources that are not localized for the default system user interface (UI) (UILanguage setting).

This setting is used by Windows Setup and Windows Deployment Services.

A fallback language is used when resources are not localized for a partially localized language. For example, Arabic is a partially localized language and contains only 80 percent of the Windows resources localized into Arabic. The fallback language for Arabic can be English or French.

You must specify this setting only if the language specified by UILanguage is not fully localized and has more than one fallback language. In all other cases, this setting will be ignored.


This setting can be applied only during the windowsPE configuration pass. To specify language and locale settings during the oobeSystem or specialize pass, see the UILanguageFallback setting in the Microsoft-Windows-International-Core component.

For the list of supported languages, locales, and identifiers, see Supported Language Packs and Default Settings.


This setting is required for all unattended installations. To prevent the Windows Setup UI from displaying, you must configure this setting. For a complete list of required settings, see Settings to Use for an Unattended Installation.



Indicates the language of the UI for resources that have not been localized into the system-preferred language.

Language_fallback is a string based on the language-tagging conventions of RFC 3066.The pattern language-region is used. Where language is an ISO-639 language code and region is an ISO 3166-1 country or region identifier. For example, en-US, fr-FR, or es-ES.

This value is not case-sensitive.

This string type supports empty elements.

Parent Hierarchy

Microsoft-Windows-International-Core-WinPE | UILanguageFallback

Valid Passes


Applies To

For the list of the supported Windows editions and architectures that this component supports, see Microsoft-Windows-International-Core-WinPE.

This setting is available to OEMs and system builders.

XML Sample

The following XML output shows how to change the fallback language to English (United States) from Arabic (Saudi Arabia).


See Also