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NS_E_WMP_FILE_OPEN_FAILED
Diagnosing NS_E_WMP_FILE_OPEN_FAILED in the Windows Media Player playback path
NS_E_WMP_FILE_OPEN_FAILED (0xC00D11B1) is returned when the Player located the source but failed while opening it for the requested operation.
Separate path resolution from the actual open operation. Record the resolved file or URL, sharing mode, access token, and underlying file or transport error so an open failure is not mislabeled as missing content.
Controlled playback comparison
- Freeze the current object state and collect path or URL, access flags, sharing mode, file attributes, parser result and first nested HRESULT.
- Reproduce this result once without automatic retries or fallback applications.
- Change only one precondition: copy the exact bytes to a local readable path and open them with the same Player build.
- Compare the first nested status and next Player event with the failed run.
- After testing it, restore the original configuration if the change was diagnostic only.
Actions that obscure the cause
- changing codecs before checking access and container parsing.
Technical references
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