HRESULT 0xC00D1070 (NS_E_WMX_ATTRIBUTE

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Description:

Cannot retrieve the specified attribute.%0

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NS_E_WMX_ATTRIBUTE_ALREADY_EXISTS	NS_E_WMX_ITEM_DOES_NOT_EXIST

NS_E_WMX_ATTRIBUTE_UNRETRIEVABLE

Understanding NS_E_WMX_ATTRIBUTE_UNRETRIEVABLE in a Windows Media playlist

NS_E_WMX_ATTRIBUTE_UNRETRIEVABLE (0xC00D1070) is returned when the playlist exposes an attribute name but cannot materialize its value in the current object state.

Distinguish in-memory Playlist state, WPL or ASX parsing, nested-list expansion, Media-object resolution and execution of referenced items. Here, the decisive boundary is the playlist exposes an attribute name but cannot materialize its value in the current object state. This result is most useful when treated as a Player checkpoint, not as a recommendation to reinstall everything.

Playlist boundary

AllStat already supplies the standard user-facing description for it; this custom block instead isolates the additional technical boundary. Earlier success in file lookup, network connection, parser creation or graph construction does not prove that the later the operation is valid.

Case-specific checkpoint: attribute index, name, source file, read/write flags, COM error information and whether the playlist is fully loaded. The controlled comparison for it is: reload the playlist into a new Player instance and retrieve the same attribute after load completion.

Closest distinction: NS_E_WMX_ATTRIBUTE_DOES_NOT_EXIST reports absence; this code reports a failed read of an identified field.

Evidence from the list model

Capture	Why it matters for it
Object or resource	attribute index, name, source file, read/write flags, COM error information and whether the playlist is fully loaded
State snapshot	Record the Player openState/playState or operation phase, object identity and exact timestamp when this result was returned.
First lower result	Keep the earliest Win32, Winsock, COM, parser, codec, DRM or device result that appears before this result.
Comparison record	Use one known-good case that follows the same API, protocol and component path while changing only the rejected precondition.

Minimal playlist experiment

Record 0xC00D1070, this result, the exact method or command and the first failure time.
Preserve attribute index, name, source file, read/write flags, COM error information and whether the playlist is fully loaded.
Perform one isolated comparison: reload the playlist into a new Player instance and retrieve the same attribute after load completion.
Repeat the original Player path after it and keep any new HRESULT as a downstream result.
confirm the expected state transition rather than only disappearance of the dialog.

What the result means

Retest outcome	Interpretation
Same it on the same object	The governing state or value is unchanged, or the caller is reusing an object created before the relevant change.
Fresh object succeeds	Lifetime, cached configuration or stale playlist/graph state contributed to it.
A later HRESULT appears	The rejected condition — the playlist exposes an attribute name but cannot materialize its value in the current object state — was cleared for it; diagnose the new code at its own layer.
Only one item or endpoint fails for it	The evidence favors resource-specific data, rights, routing or device state rather than a global Player failure.

Actions that obscure the cause

assuming an empty string is equivalent to a failed attribute read.
Do not discard the first occurrence by repeatedly invoking Play, open, save or retry; later events can replace its original state.
do not publish credentials, private URLs, license material or complete protected-content headers; retain only redacted identifiers, lengths, hashes and protocol fields.

Technical references

Close it only when the original operation crosses this boundary and reaches the expected next Player state.

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