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NS_E_WMPCORE_WMX_LIST_ITEM_ATTRIBUTE_NAME_EMPTY
What this HRESULT actually isolates
0xC00D1095 maps to NS_E_WMPCORE_WMX_LIST_ITEM_ATTRIBUTE_NAME_EMPTY. Its actionable interpretation is an item-level WMX attribute is emitted without a name 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 the item index, source element and serializer field that produced the blank name; that evidence is more useful than reinstalling the Player or changing several unrelated settings at once.
How this layer works
The playback core WMX list item attribute name empty workflow must be separated from a generic WMP failure: windows Media metafiles are XML documents, but a well-formed document can still violate required ASX element and attribute rules. It also matters that 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 for playback core WMX list item attribute name empty: One media item contains a nameless custom attribute while the surrounding list remains valid. 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 the item index, source element and serializer field that produced the blank name |
| 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_WMX_LIST_ITEM_ATTRIBUTE_NAME_ILLEGAL | An item-level WMX attribute name is not legal for that media item scope |
NS_E_WMPCORE_WMX_LIST_ATTRIBUTE_VALUE_EMPTY | A recognized list-level WMX attribute has an empty value where one is required |
NS_E_WMPCORE_WMX_LIST_ITEM_ATTRIBUTE_VALUE_EMPTY | An item-level WMX attribute has an empty or unusable lexical value |
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 the item index, source element and serializer field that produced the blank name.
- Apply the smallest supported remedy for this condition: emit a supported item attribute name or remove the empty field.
Correct the producing condition
The targeted correction for this condition is to emit a supported item attribute name or remove the empty field. 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.
Technical references
- Windows Media metafile reference — documentation used to identify the producing boundary of this result.
- 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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