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STATUS_MUI_INVALID_FILE
The language resource file exists but is not valid for loading
Finding a .mui file is only the first step. The MUI loader validates the resource file, its resource configuration data, language identity, checksums, and relationship to the language-neutral binary. A file can therefore exist at the expected path and still be rejected.
Common causes are corruption, a partial application update, mixing satellite resources from different versions, or post-build modification that invalidated the association. The correct fix is to restore a matching package, not to bypass validation.
What to inspect
- Compare file version, product package, architecture, and servicing level with the base module.
- Inspect RC Config and checksums using MUIRCT where available.
- Check storage and deployment logs for truncation or replacement of the .mui file.
- Do not patch checksums manually unless rebuilding the complete resource package.
References
- Microsoft Open Specifications: NTSTATUS values
- Microsoft: MUI resource management
- Microsoft: MUI resource utilities
- Wine source: locale and MUI APIs
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