What does HRESULT 0xC00D11BB (NS_E_WMP_INVALID_PROTOCOL) mean?

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Description:

Windows Media Player cannot play the file because the specified protocol is not supported. If you typed a URL in the Open URL dialog box, try using a different transport protocol (for example, "http:" or "rtsp:").%0

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NS_E_WMP_AUDIO_HW_PROBLEM	NS_E_WMP_INVALID_LIBRARY_ADD

NS_E_WMP_INVALID_PROTOCOL

Diagnosing NS_E_WMP_INVALID_PROTOCOL in the Windows Media Player playback path

NS_E_WMP_INVALID_PROTOCOL (0xC00D11BB) is returned when the URL explicitly requests a transport scheme the Player does not support in the current configuration.

Record what the Player had already completed because later retries often replace the original evidence. The specific rejected condition is the URL explicitly requests a transport scheme the Player does not support in the current configuration.

Controlled playback comparison

Start from the original call and log 0xC00D11BB together with its object and operation phase.
Collect raw URL, parsed scheme, supported protocol list, enabled settings and object-model proxy record before changing the machine.
Use this single-variable test: replace only the scheme with a documented supported transport for the same server resource.
Repeat on a fresh object if the original predates a configuration, device or resource change.
Validate the expected next operation, not just initial open or object creation.

Actions that obscure the cause

adding the scheme name as a file association.

Technical references

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