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STATUS_MUI_INVALID_ULTIMATEFALLBACK_NAME
The final fallback language is malformed
MUI can record an ultimate fallback language used when none of the preferred UI languages supplies the requested resource. The value is stored in resource configuration data and must be a valid language tag. If it is malformed, the loader cannot complete its final fallback step reliably.
This usually originates in the resource build configuration, for example an incorrect ultimateFallbackLanguage attribute or RC compiler language option. It is not fixed by installing additional language packs because the fallback declaration itself is invalid.
What to inspect
- Inspect ultimateFallbackLanguage and ultimateFallbackLocation in the resource configuration.
- Validate the language name and ensure the intended fallback resource is internal or externally deployed as declared.
- Compare generated LN and language-specific files to the same configuration source.
- Rebuild all associated resources after correcting the fallback value.
References
- Microsoft Open Specifications: NTSTATUS values
- Microsoft: preparing a resource configuration file
- Microsoft: MUI resource utilities
- Microsoft: user interface language management
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