ERROR_MUI_INTLSETTINGS_UILANG_NOT_INSTALLED: meaning and diagnosis

Status / error code:		Category:

Constant name:
Source:		Operating System:
Description: The requested Windows UI language could not be installed.

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ERROR_RESOURCE_ENUM_USER_STOP	ERROR_MUI_INTLSETTINGS_INVALID_LOCALE_NAME

ERROR_MUI_INTLSETTINGS_UILANG_NOT_INSTALLED

ERROR_MUI_INTLSETTINGS_UILANG_NOT_INSTALLED means Windows could not complete installation of the requested display-language resources. This is a language-pack or system-language configuration problem, not an error in one application string.

Check the language-pack installation state, component servicing events, and whether the requested UI language is supported by this Windows edition. Repair the system language capability before retrying application-level localization work.

What to check

Verify that the target display language and its required language features are available for the Windows edition.
Check servicing and language-pack installation logs for the first deployment failure.
Retry after repairing the language package rather than copying application .mui files into system folders.

Microsoft: MUI Resource Management

Microsoft: Deploying multilingual resources

Microsoft: About Multilingual User Interface

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