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NS_E_WMP_FAILED_TO_SAVE_PLAYLIST
How to classify this WMP result
Windows Media Player reports NS_E_WMP_FAILED_TO_SAVE_PLAYLIST (0xC00D0FF1) when the playlist manager cannot satisfy the Player failed to save playlist structural or runtime condition. The failed to save playlist condition is owned by 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 playlist bytes, element stack, resolved URLs and current item/alternate state; that evidence is more useful than reinstalling the Player or changing several unrelated settings at once.
Investigation order
- 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- Exclude a stale callback or superseded object generation as the source of this event.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 playlist bytes, element stack, resolved URLs and current item/alternate state.
- Apply the smallest supported remedy for this condition: correct the specific playlist construct or state transition.
The surrounding WMP state
Representative case: The playlist is present, but one reference, boundary or item state is inconsistent. The example isolates only the producing component.
Inputs that distinguish the causes
Preserve the first occurrence before retry or fallback changes the evidence. Capture one consistent object generation:
| Field | What to record |
|---|---|
| Decisive check | Record playlist bytes, element stack, resolved URLs and current item/alternate state |
| Artifact identity | Current item index, alternate index and nested-playlist depth |
| Runtime state | Repeat/event boundary and the media object expected at its start or end |
| Owning object | Playlist URL, format, response content type and exact downloaded bytes |
| Lower-level result | ASX version and element stack at the failure |
| Correlation | Resolved base URL for REF or ENTRYREF targets |
Log paths, hashes, IDs, offsets, and HRESULTs. Exclude secrets and unrelated content from logs.
Do not confuse it with nearby results
| Result | Different boundary |
|---|---|
NS_E_WMPCORE_INVALIDPLAYLISTMODE | The playlist manager received a play-mode value it does not implement |
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 |
If this result is followed by a broader “cannot play,” “cannot load,” or “operation failed” result, preserve the earlier event. The later code can be a consequence from a wrapper, fallback item or UI layer rather than the producing failure.
Verification after correction
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 a real fix must change
The targeted correction for this condition is to correct the specific playlist construct or state transition. 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.
Code-specific operational note
Use this result, 0xC00D0FF1 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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