What does Windows error code 15105 (ERROR_MUI_FILE_NOT_LOADED) mean?

Status / error code:		Category:

Constant name:
Source:		Operating System:
Description: The MUI resource loader did not have the requested resource file in its cache.

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ERROR_MUI_INVALID_ULTIMATEFALLBACK_NAME	ERROR_RESOURCE_ENUM_USER_STOP

ERROR_MUI_FILE_NOT_LOADED

ERROR_MUI_FILE_NOT_LOADED means a caller expected a MUI resource entry that the Windows resource loader had not loaded. This can happen when the requested language resource is absent, invalid, or not associated with the language-neutral file.

Verify that the language-neutral binary and matching .mui file are deployed in the expected language directory and version pair. Loading an unrelated or stale MUI file by path does not establish the association the resource loader requires.

What to check

Confirm that the requested UI language has a deployed .mui file in the expected language subfolder.
Check for an earlier MUI validation or locale error; this code is often a later symptom.
Restart the application after repairing or redeploying resources so it rebuilds its resource-loading state.

Microsoft: MUI Resource Management

Microsoft: Deploying multilingual resources

Microsoft: About Multilingual User Interface

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