NS_E_WMP_CONVERT_PLUGIN_UNKNOWN_FILE_OWNER: meaning and diagnosis

Status / error code:

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Description:

Windows Media Player cannot add the file to the library. The plug-in required to add the file is not installed properly. For assistance, contact the company that provided the file.%0

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NS_E_WMP_CONVERT_PLUGIN_UNAVAILABLE_NOERRORURL	NS_E_DVD_DISC_COPY_PROTECT_OUTPUT_NS

NS_E_WMP_CONVERT_PLUGIN_UNKNOWN_FILE_OWNER

Diagnosing NS_E_WMP_CONVERT_PLUGIN_UNKNOWN_FILE_OWNER during Windows Media library import

NS_E_WMP_CONVERT_PLUGIN_UNKNOWN_FILE_OWNER (0xC00D115E) is returned when the library cannot map the file type to a known conversion plug-in owner.

Identify whether library insertion reached path validation, type detection, plug-in activation, rights evaluation or database update. The relevant condition is the library cannot map the file type to a known conversion plug-in owner.

Controlled import comparison

Capture the resource identity and extension, sniffed format, MIME type, registered handlers and the first bytes used for format detection.
Verify that the caller uses the current Playlist, Media, Network, graph, device or DRM object instance.
Run the narrow experiment: rename nothing; provide a standards-valid sample with the same extension and compare handler discovery.
Do not combine this focused test with a codec-pack change, Player reset, or broad registry cleanup.
If the retest returns a different specific HRESULT, diagnose that new failure as the next stage.

Interpreting the library result

Retest outcome	Interpretation
A later HRESULT appears	The rejected condition — the library cannot map the file type to a known conversion plug-in owner — was cleared; diagnose the new code at its own layer.

Actions that obscure the cause

registering the media file itself as a COM server.

Technical references

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