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NS_E_WMP_PATH_ALREADY_IN_LIBRARY
NS_E_WMP_PATH_ALREADY_IN_LIBRARY: the path being added is already represented in the Windows Media Player library
NS_E_WMP_PATH_ALREADY_IN_LIBRARY (0xC00D0FBA) identifies a narrow contract boundary: the path being added is already represented in the Windows Media Player library. Do not replace it with a generic subsystem failure when the symbolic result already tells you which state or input was rejected.
Evidence
record canonical path, library folder mapping, duplicate/redirected paths, user library database, and the add operation.
Verification
reuse the existing library location or remove the duplicate registration intentionally; do not create another alias for the same canonical path.
Technical references
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