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NS_E_WMPCORE_INVALIDPLAYLISTMODE
What this HRESULT actually isolates
0xC00D1081 maps to NS_E_WMPCORE_INVALIDPLAYLISTMODE. Its actionable interpretation is the playlist manager received a play-mode value it does not implement within the Windows Media playlist and metafile state machine; the producing mechanism is the layer that turns ASX/WAX/WVX/WMX or library playlists into Media objects, resolves REF and ENTRYREF URLs, expands nesting, handles EVENT and REPEAT blocks and advances to alternates.
An additional test is to record play mode, source of the value and Player version; that evidence is more useful than reinstalling the Player or changing several unrelated settings at once.
How this layer works
Representative case for playback core invalid playlist mode: A host passes its own enum value where WMP expects normal or shuffle semantics. The example isolates only the producing component.
Evidence to capture before retry
Preserve the first occurrence before retry or fallback changes the evidence. Capture one consistent object generation:
| Field | What to record |
|---|---|
| Decisive check | Record play mode, source of the value and Player version |
| Artifact identity | Playlist URL, format, response content type and exact downloaded bytes for this reproduction |
| Runtime state | ASX version and element stack at the failure for this reproduction |
| Owning object | Resolved base URL for REF or ENTRYREF targets for this reproduction |
| Lower-level result | Current item index, alternate index and nested-playlist depth for this reproduction |
| Correlation | Repeat/event boundary and the media object expected at its start or end for this reproduction |
Log paths, hashes, IDs, offsets, and HRESULTs. Exclude secrets and unrelated content from logs.
Why the symbolic name matters
| Result | Different boundary |
|---|---|
NS_E_WMPCORE_ITEMNOTINPLAYLIST | The requested Media object is not a member of the current Playlist generation |
NS_E_WMPCORE_PLAYLISTEMPTY | The current playlist contains zero media items at the point an item is required |
NS_E_WMPCORE_PLAYLIST_EMPTY_OR_SINGLE_MEDIA | The requested playlist operation requires multiple items, but the list has at most one |
If this result is followed by a broader “cannot play,” “cannot load,” or “operation failed” result, preserve the earlier event. A later wrapper error may be secondary.
A focused diagnostic sequence
- Start with the symbolic value this result; do not diagnose the failure from the final dialog alone.
- Record the bytes or object state that produced this condition before automatic recovery mutates it.
- Exclude a stale callback or superseded object generation as the source of this event.
- Use this deciding observation for this condition: record play mode, source of the value and Player version.
- Apply the smallest supported remedy for this condition: use a supported mode or translate application-specific modes before calling WMP.
Correct the producing condition
The targeted correction for this condition is to use a supported mode or translate application-specific modes before calling WMP. Keep the original failing input until the same operation succeeds after one controlled change.
- Avoid flattening or rewriting a playlist before preserving the failing nesting and base-URL rules; it can destroy the artifact or state needed to explain this result.
- Avoid assuming every unplayable item means the playlist parser itself failed; that can replace the original HRESULT with a secondary failure from another layer.
Regression check
After correction, create a fresh Player, control, parser or playlist object and rerun the smallest reproducer for this HRESULT. Verify the resulting resource, list membership, saved file, library object or play state.
What to search for in traces
Use this result, 0xC00D1081 and the symbolic phrase in traces. Correlate search keys with API and object.
Technical references
- Windows Media metafile reference — documentation used to identify the producing boundary of it.
- Metafile elements reference — normative or platform material relevant to it.
- ENTRYREF element — API or format context for this HRESULT.
- REPEAT element It.
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