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NS_E_WMPCORE_PLAYLIST_ITEM_ALTERNATE_NAME_NOT_FOUND
Where the Player stopped
The symbolic result NS_E_WMPCORE_PLAYLIST_ITEM_ALTERNATE_NAME_NOT_FOUND narrows 0xC00D10A1 to the playback core playlist item alternate name not found condition: the named alternate playlist cannot be found in the available alternate set. Keep the playback core playlist item alternate name not found boundary visible when a later dialog reduces it to a general media error.
An additional test is to record requested alternate name and names parsed from the playlist; that evidence is more useful than reinstalling the Player or changing several unrelated settings at once.
State worth preserving
Capture state before Player cleanup:
- What to verify: record requested alternate name and names parsed from the playlist.
- Artifact: ASX version and element stack at the failure.
- State: resolved base URL for REF or ENTRYREF targets.
- Object identity: current item index, alternate index and nested-playlist depth.
- Underlying evidence: repeat/event state and the media object expected at its start or end.
- Correlation: playlist URL, format, response content type and exact downloaded bytes.
Reproduce without destroying evidence
- Preserve
0xC00D10A1, the ErrorItem context and the object instance involved in the failing operation. - Confirm the failure directly: record requested alternate name and names parsed from the playlist.
- After you correct the name/reference or include the intended alternate, recreate the owning WMP object and verify that the corrected generation completes.
What succeeds before this failure
Representative case: A script requests an alternate removed from the latest playlist.
Related HRESULTs with different meanings
| Result | Different condition |
|---|---|
NS_E_WMPCORE_PLAYLIST_ITEM_ALTERNATE_EXHAUSTED | All configured alternate references have already been attempted without success |
NS_E_WMPCORE_PLAYLIST_ITEM_ALTERNATE_MORPH_FAILED | The core cannot switch the active media object into the selected alternate representation |
NS_E_WMPCORE_PLAYLIST_ITEM_ALTERNATE_INIT_FAILED | The selected alternate media object cannot initialize before becoming active |
Recovery at the right layer
Change the responsible precondition rather than masking the symptom: correct the name/reference or include the intended alternate.
How to know the repair is real
Keep one fixture that reproduces 0xC00D10A1 and one corrected fixture that changes only the identified precondition.
Technical references
- Windows Media metafile reference — API or format context.
- Metafile elements reference — documentation for this result.
- ENTRYREF element — normative or platform material relevant to this result.
- REPEAT element
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