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WU_E_EXTENDEDERROR_FAILED
WU_E_EXTENDEDERROR_FAILED means Windows Update did expose an extended error field, but it contains only a general failure rather than a useful component-specific code.
What to do next
- Search earlier log records for the first non-generic HRESULT, package name, or servicing error.
- Check whether the update is a component package, MSI-based package, driver, or AppX package, then inspect the appropriate companion logs.
- Use the extended error only as a marker in the timeline, not as a root-cause diagnosis.
Microsoft: IUpdateInstaller interface
Microsoft: Windows Update log files
Microsoft: Windows Update error reference
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