What does Windows error code 15101 (ERROR_MUI_INVALID_FILE) mean?

Status / error code:		Category:

Constant name:
Source:		Operating System:
Description: The MUI resource file failed validation and could not be loaded.

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ERROR_MUI_FILE_NOT_FOUND	ERROR_MUI_INVALID_RC_CONFIG

ERROR_MUI_INVALID_FILE

ERROR_MUI_INVALID_FILE means Windows rejected a language-specific .mui resource file during validation. A MUI deployment pairs language-neutral application code with language-specific resources; the loader validates their association before loading the resource file.

What to check

Confirm that the .mui file was deployed with the language-neutral executable or DLL from the same build.
Check that the language folder and file name follow the MUI layout expected for the associated language-neutral file.
Rebuild and redeploy the resource file instead of copying a .mui file from a different product version.

Microsoft: MUI Resource Management

Microsoft: Deploying multilingual resources

Microsoft: About Multilingual User Interface

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