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NS_E_MLS_SMARTPLAYLIST_FILTER_NOT_REGISTERED
Understanding NS_E_MLS_SMARTPLAYLIST_FILTER_NOT_REGISTERED in a Windows Media playlist
NS_E_MLS_SMARTPLAYLIST_FILTER_NOT_REGISTERED (0xC00D1075) is returned when an auto-playlist references a query filter type for which the Player has no registered implementation.
Distinguish in-memory Playlist state, WPL or ASX parsing, nested-list expansion, Media-object resolution and execution of referenced items. This result identifies a narrower stage than the dialog text exposes, so preserve its operation before trying a workaround. In this case the rejected checkpoint is an auto-playlist references a query filter type for which the Player has no registered implementation.
Playlist 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: filter name or GUID, smart-playlist XML, installed WMP components, bitness and registration location. The controlled comparison for this HRESULT is: replace the unknown filter with one documented built-in condition and rebuild the auto playlist.
Closest distinction: An empty query result is valid; this code means the filter engine itself cannot be located.
Evidence from the list model
| Capture | Why it matters for this HRESULT |
|---|---|
| Object or resource | filter name or GUID, smart-playlist XML, installed WMP components, bitness and registration location |
| 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. |
Minimal playlist experiment
- Freeze the current object state and collect filter name or GUID, smart-playlist XML, installed WMP components, bitness and registration location.
- Reproduce this result once without automatic retries or fallback applications.
- Change only one precondition: replace the unknown filter with one documented built-in condition and rebuild the auto playlist.
- 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.
What the result means
| 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 — an auto-playlist references a query filter type for which the Player has no registered implementation — 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
- installing unrelated playback codecs.
- 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
- Windows Media Player SDK
- Windows Media Playlists
- Windows Media Playlist elements
- Managing playlists
- Microsoft HRESULT registry
After it, a different downstream HRESULT is progress and should be recorded as a separate condition.
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