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NS_E_BKGDOWNLOAD_INVALID_FILE_NAME
Diagnostic meaning beyond the standard message
The actionable meaning of 0xC00D126B / NS_E_BKGDOWNLOAD_INVALID_FILE_NAME is deriving a valid final filename for the requested download.
Why the operation can reach this point
The Player’s download manager coordinates an owner window, a plug-in, background job identity, temporary files and final completion or cancellation. A downloaded .wmd package adds an extraction and cataloguing phase after transfer.
Receiving all network bytes is not the same as completing the job, moving the temporary file or successfully unpacking and cataloguing a Windows Media Download package. One concrete reproduction is: the server-supplied title expands to an empty or invalid Windows filename.
Evidence matrix
| Evidence | Why it matters for invalid file name |
|---|---|
| Producing object and operation | job GUID and Player signature, BITS/job state, expected and actual file count, remote and local names, temporary path, completion/cancel request, plug-in and callback identity, COM apartment, WMD extraction result and first underlying HRESULT |
| Key observation | remote URL, content metadata, proposed local name, path rules and destination |
| Controlled comparison | Repeat the producing call after changing only this condition: sanitize or supply a legal unique local filename before creating the file entry. |
Minimal experiment
- Capture
0xC00D126B, the exact Player/API operation and the first timestamp at which it appears. - Save remote URL, content metadata, proposed local name, path rules and destination; do this before ejecting media, reconnecting a device, canceling a job or rebuilding the Player object.
- Correlate the result with job GUID and Player signature, BITS/job state, expected and actual file count, remote and local names, temporary path, completion/cancel request, plug-in and callback identity, COM apartment, WMD extraction result and first underlying HRESULT.
- Reproduce once with the original source and destination, then apply only this change: sanitize or supply a legal unique local filename before creating the file entry.
Do not collapse it with these results
| Related result | Different condition |
|---|---|
NS_E_IMAGE_DOWNLOAD_FAILED | downloading or committing an image resource used by the Player or content service |
NS_E_INTERFACE_NOT_REGISTERED_IN_GIT | retrieving a COM interface from the Global Interface Table in another apartment |
NS_E_BKGDOWNLOAD_FAILEDINITIALIZE | starting the overall background-download manager and job database |
Recovery and verification
Resolve the responsible precondition: Sanitize or supply a legal unique local filename before creating the file entry. A successful retest must pass the same invalid file name checkpoint, not merely hide the message in a different UI path.
Authoritative documentation
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