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NS_E_PLUGIN_CLSID_INVALID
NS_E_PLUGIN_CLSID_INVALID: the failing boundary
NS_E_PLUGIN_CLSID_INVALID (0xC00D1B76) means The plug-in CLSID specified is not valid. The important boundary is plug-in identity; do not replace this result with a broader “Windows Media failed” diagnosis.
What this result proves
This code proves that the supplied plug-in CLSID is syntactically invalid or cannot be used as a CLSID value. It does not, by itself, prove a codec, permissions, network, device, or media problem outside that boundary. Preserve the first lower-level result when one exists, because later Player or Encoder errors can hide the original cause.
Evidence and focused verification
Record the original clsid string/value and the api that parsed it; correct the identifier before investigating registration or plug-in loading. Keep the media object, endpoint, profile, or device identity fixed while changing only that rejected precondition. A successful retest should pass this exact boundary; a different HRESULT from a later stage is new evidence, not recurrence of NS_E_PLUGIN_CLSID_INVALID.
Technical references
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