What does HRESULT 0xC00D1097 (NS_E_WMPCORE_WMX_LIST_ITEM_ATTRIBUTE_VALUE_EMPTY) mean?

NS_E_WMPCORE_WMX_LIST_ITEM_ATTRIBUTE_VALUE_EMPTY

The exact condition behind the dialog

The symbolic result NS_E_WMPCORE_WMX_LIST_ITEM_ATTRIBUTE_VALUE_EMPTY narrows 0xC00D1097 to the playback core WMX list item attribute value empty condition: an item-level WMX attribute has an empty or unusable lexical value. Keep the playback core WMX list item attribute value empty boundary visible when a later dialog reduces it to a general media error.

An additional test is to record item index, accepted name, raw value including whitespace and expected conversion type; that evidence is more useful than reinstalling the Player or changing several unrelated settings at once.

What succeeds before this failure

Representative case: A media item carries a recognized duration or URL-related field whose serialized value is blank. The example isolates only the producing component.

State worth preserving

Capture state before Player cleanup:

• Decisive check: record item index, accepted name, raw value including whitespace and expected conversion type.
• Artifact: repeat/event boundary and the media object expected at its start or end.
• State: playlist URL, format, response content type and exact downloaded bytes.
• Object identity: ASX version and element stack at the failure.
• Underlying evidence: resolved base URL for REF or ENTRYREF targets.
• Correlation: current item index, alternate index and nested-playlist depth.

Log paths, hashes, IDs, offsets, and HRESULTs. Exclude secrets and unrelated content from logs.

Reproduce without destroying evidence

1. Preserve 0xC00D1097, the ErrorItem context and the object generation involved in the failing operation.
2. Compare the failing artifact with a known-good artifact that differs only in the suspected property.
3. Separate acquisition, parsing, object construction, playback and persistence until the component that produced the failure is clear.
4. Confirm the failure directly: record item index, accepted name, raw value including whitespace and expected conversion type.
5. After you write a valid value for that item property or omit the optional property, recreate the owning WMP object and verify that the corrected generation completes.

Related HRESULTs, different boundaries

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.

Recovery at the right layer

Change the responsible precondition rather than masking the symptom: write a valid value for that item property or omit the optional property. A retry is meaningful only after that recorded condition changes.

• 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.

How to know the repair is real

Keep one fixture that reproduces 0xC00D1097 and one corrected fixture that changes only the identified precondition. This condition correction is complete when the intended operation succeeds without being replaced by a neighboring WMP HRESULT.

Practical interpretation

Use this result, 0xC00D1097 and the symbolic phrase in traces. Correlate search keys with API and object.

Technical references

• Windows Media metafile reference — API or format context for this HRESULT.
• Metafile elements reference — documentation used to identify the producing boundary of this result.
• ENTRYREF element — normative or platform material relevant to this result.
• REPEAT element

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