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NS_E_WMPCORE_WMX_LIST_ITEM_ATTRIBUTE_NAME_ILLEGAL
What this HRESULT means
The symbolic result NS_E_WMPCORE_WMX_LIST_ITEM_ATTRIBUTE_NAME_ILLEGAL narrows 0xC00D1096 to the playback core WMX list item attribute name illegal condition: an item-level WMX attribute name is not legal for that media item scope. Keep the playback core WMX list item attribute name illegal boundary visible when a later dialog reduces it to a general media error.
An additional test is to record the exact spelling, namespace, item element and list-versus-item schema decision; that evidence is more useful than reinstalling the Player or changing several unrelated settings at once.
What succeeds before this failure
Two rules frame this diagnosis. First, Windows Media metafiles are XML documents, but a well-formed document can still violate required ASX element and attribute rules. In this case, relative references are resolved against the containing metafile URL, and nested playlists introduce a stack and a new base URL rather than a simple flat list.
Representative case: A list-only property is copied onto each media item by a generic XML exporter.
State worth preserving
Capture state before Player cleanup:
- What to verify: record the exact spelling, namespace, item element and list-versus-item schema decision.
- Artifact: resolved base URL for REF or ENTRYREF targets.
- State: current item index, alternate index and nested-playlist depth.
- Object identity: repeat/event state and the media object expected at its start or end.
- Underlying evidence: playlist URL, format, response content type and exact downloaded bytes.
- Correlation: ASX version and element stack at the failure.
Reproduce without destroying evidence
- Use this deciding observation for this condition: record the exact spelling, namespace, item element and list-versus-item schema decision.
- Apply the smallest supported remedy for this condition: replace the name with an attribute supported on the item or move it to its valid scope.
Related HRESULTs with different meanings
| Result | Different condition |
|---|---|
NS_E_WMPCORE_WMX_LIST_ITEM_ATTRIBUTE_NAME_EMPTY | An item-level WMX attribute is emitted without a name |
NS_E_WMPCORE_WMX_LIST_ITEM_ATTRIBUTE_VALUE_EMPTY | An item-level WMX attribute has an empty or unusable lexical value |
NS_E_WMPCORE_LIST_ENTRY_NO_REF | A playlist entry object reaches list construction without an attached media reference |
Recovery at the right layer
The targeted correction for this condition is to replace the name with an attribute supported on the item or move it to its valid scope. Keep the original failing input until the same operation succeeds after one controlled change.
How to know the repair is real
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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