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NS_E_WALKER_UNKNOWN
NS_E_WALKER_UNKNOWN — 0xC00D004C
Diagnosing NS_E_WALKER_UNKNOWN
NS_E_WALKER_UNKNOWN identifies this Windows Media Services boundary: unknown file type.
Why this boundary matters
This HRESULT belongs to media identification, parsing or stream/reference interpretation. Preserve the original bytes or references, the selected parser/protocol and the first rejected field, block or offset so a different test file does not hide the failing input.
Evidence to collect
| Field | What to preserve |
|---|---|
| Input | Exact URL/path, content hash or reference list presented to the parser/walker. |
| Selector | Parser, walker, protocol or stream type selected for that input. |
| Failure point | First rejected field, block, reference or stream offset when the component exposes it. |
| Lower result | First parser/read/protocol status before the server-level HRESULT is reported. |
Decision rule
A different file is only a control. The repair must make the original bytes or references pass the same parser/protocol boundary without silently substituting another input.
Focused test
Record the file extension/content type and parser lookup; verify whether any registered walker recognizes that exact input before renaming the file.
Verification
Use the same media bytes or reference list and the same intended parser/protocol. The fix is demonstrated when that original input passes the previously failing parse/selection stage; a different file is only a control.
Technical references
- System playlist parser plug-ins
- Using URL and server rollover
- Windows Media protocol glossary
- Microsoft HRESULT values for the Windows Media namespace
For automation, log the symbolic name as well as the numeric HRESULT. The symbolic name preserves the Windows Media subsystem boundary that a generic COM error formatter can obscure.
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