What does Windows error code 15100 (ERROR_MUI_FILE_NOT_FOUND) mean?

Status / error code:		Category:

Constant name:
Source:		Operating System:
Description: The Windows resource loader could not find the required language-specific MUI resource file.

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ERROR_EC_NO_ACTIVE_CHANNEL	ERROR_MUI_INVALID_FILE

ERROR_MUI_FILE_NOT_FOUND

A required MUI resource file was not found

ERROR_MUI_FILE_NOT_FOUND means Windows resource loading selected a language-specific MUI resource but could not find the required file. The result is about the resource lookup/fallback chain for a particular binary and language, not about software localization in general.

What to capture

Record the base module, requested resource, user/system UI language list, and the exact .mui path Windows attempted to use.
Compare the base binary and MUI file versions. Servicing or deployment that updates only one side can leave a resource set incomplete.
Verify that the expected language pack or application resource package is actually installed and that its directory structure was preserved.

Recovery

Restore the matching MUI resource from the authoritative application package, language pack, or Windows servicing source. Do not manufacture a blank .mui file or copy an arbitrary resource from another build merely to satisfy the pathname.

After repair, repeat the same resource lookup under the same UI-language configuration and confirm that fallback resolves the expected localized resource.

Official references

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