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NS_E_WMPCORE_WMX_ENTRYREF_NO_REF
What this HRESULT actually isolates
Windows Media Player reports NS_E_WMPCORE_WMX_ENTRYREF_NO_REF (0xC00D10B4) when an ENTRYREF element was parsed without its required HREF target. The playback core WMX ENTRYREF no REF 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 the ENTRYREF XML and base URL used for resolution; that evidence is more useful than reinstalling the Player or changing several unrelated settings at once.
Inputs that distinguish the causes
Preserve the first occurrence before retry or fallback changes the playback core WMX ENTRYREF no REF evidence. Capture one consistent object instance:
| Field | What to record |
|---|---|
| What to verify | Record the ENTRYREF XML and base URL used for resolution |
| 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 point and the media object expected at its start or end for this reproduction |
The surrounding WMP state
Representative case: A templated ENTRYREF remains after its target URL was omitted.
Do not confuse it with nearby results
| Result | Different condition |
|---|---|
NS_E_WMPCORE_NO_PLAYABLE_MEDIA_IN_PLAYLIST | The playlist parsed, but every item failed availability, format, rights or graph checks |
NS_E_WMPCORE_PLAYLIST_EMPTY_NESTED_PLAYLIST_SKIPPED_ITEMS | A nested playlist yields no playable items after invalid or unsupported children are skipped |
NS_E_WMPCORE_PLAYLIST_IMPORT_FAILED_NO_ITEMS | Library import produced no items from the selected playlist |
Investigation order
- Use this deciding observation for this condition: record the ENTRYREF XML and base URL used for resolution.
- Apply the smallest supported remedy for this condition: supply a valid HREF to an external metafile or remove the empty element.
Verification after correction
What a real fix must change
The targeted correction for this condition is to supply a valid HREF to an external metafile or remove the empty element. Keep the original failing input until the same operation succeeds after one controlled change.
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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