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ERROR_UNKNOWN_PROPERTY
ERROR_UNKNOWN_PROPERTY means that the requested installer property is not known in the current product, database, or session context. The result is about the property lookup; it does not identify a missing file or a general Windows setting.
Record whether the caller is querying a database property, session property, or installed-product property and use the corresponding MSI API. Property scope changes across phases, so a name valid during installation may not exist in later maintenance queries.
What to check
- Check the exact property name, including the expected spelling and capitalization used by the package or API contract.
- Verify that the operation occurs after the package and database state that define the property have been opened.
- For package authors, inspect the Property table and custom-action conditions that reference the property.
Microsoft: Windows Installer error codes · Microsoft: Installer function reference
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