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NS_E_WMP_CONVERT_FILE_FAILED
Diagnosing NS_E_WMP_CONVERT_FILE_FAILED during Windows Media library import
NS_E_WMP_CONVERT_FILE_FAILED (0xC00D1158) is returned when the library import conversion pipeline failed to create a usable library representation for the source file.
Identify whether library insertion reached path validation, type detection, plug-in activation, rights evaluation or database update. Here, the decisive boundary is the library import conversion pipeline failed to create a usable library representation for the source file. This result is most useful when treated as a Player checkpoint, not as a recommendation to reinstall everything.
Library-import boundary
AllStat already supplies the standard user-facing description for this HRESULT; this custom block instead isolates the additional technical boundary. Earlier success in file lookup, network connection, parser creation or graph construction does not prove that the later the operation is valid.
Case-specific checkpoint: source path, media type, conversion plug-in CLSID, output temp path, nested HRESULT and library access level. The controlled comparison for this HRESULT is: import one known-good file of the same claimed type through MediaCollection.add, then compare plug-in selection.
Closest distinction: NS_E_WMP_INVALID_LIBRARY_ADD rejects a format at the library boundary without necessarily invoking conversion.
Handler and source evidence
| Capture | Why it matters for this HRESULT |
|---|---|
| Object or resource | source path, media type, conversion plug-in CLSID, output temp path, nested HRESULT and library access level |
| State snapshot | Record the Player openState/playState or operation phase, object identity and exact timestamp when this result was returned. |
| First lower result | Keep the earliest Win32, Winsock, COM, parser, codec, DRM or device result that appears before this result. |
| Comparison record | Use one known-good case that follows the same API, protocol and component path while changing only the rejected precondition. |
Controlled import comparison
- Record
0xC00D1158, this result, the exact method or command and the first failure time. - Preserve source path, media type, conversion plug-in CLSID, output temp path, nested HRESULT and library access level.
- Perform one isolated comparison: import one known-good file of the same claimed type through MediaCollection.add, then compare plug-in selection.
- Repeat the original Player path after it and keep any new HRESULT as a downstream result.
- confirm the expected state transition rather than only disappearance of the dialog.
Interpreting the library result
| Retest outcome | Interpretation |
|---|---|
| Same it on the same object | The governing state or value is unchanged, or the caller is reusing an object created before the relevant change. |
| Fresh object succeeds | Lifetime, cached configuration or stale playlist/graph state contributed to it. |
| A later HRESULT appears | The rejected condition — the library import conversion pipeline failed to create a usable library representation for the source file — was cleared for this HRESULT; diagnose the new code at its own layer. |
| Only one item or endpoint fails for this HRESULT | The evidence favors resource-specific data, rights, routing or device state rather than a global Player failure. |
Actions that obscure the cause
- moving the source file after the conversion has started.
- Do not discard the first occurrence by repeatedly invoking Play, open, save or retry; later events can replace its original state.
- do not publish credentials, private URLs, license material or complete protected-content headers; retain only redacted identifiers, lengths, hashes and protocol fields.
Technical references
- MediaCollection.add
- About the Windows Media Player library
- Managing media items
- Windows Media Player plug-ins
- Microsoft HRESULT registry
Close it only when the original operation crosses this boundary and reaches the expected next Player state.
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