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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
- 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.
Inputs that distinguish the causes
| Field | What to record |
|---|---|
| What to verify | 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 |
Do not confuse it with nearby results
| Result | Different condition |
|---|---|
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
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.
Technical references
- Windows Media metafile reference — documentation for this HRESULT.
- Metafile elements reference — normative or platform material relevant to this HRESULT.
- ENTRYREF element — API or format context.
- REPEAT element
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