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NS_E_WMX_ITEM_UNSETTABLE
Understanding NS_E_WMX_ITEM_UNSETTABLE in a Windows Media playlist
NS_E_WMX_ITEM_UNSETTABLE (0xC00D1073) is returned when the playlist item exists but the selected property or slot is read-only in its current representation.
Distinguish in-memory Playlist state, WPL or ASX parsing, nested-list expansion, Media-object resolution and execution of referenced items. Record what the Player had already completed because later retries often replace the original evidence. The specific rejected condition is the playlist item exists but the selected property or slot is read-only in its current representation.
Playlist boundary
AllStat already supplies the standard user-facing description for this HRESULT; 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: item type, property name, load source, auto/static playlist status and access rights. The controlled comparison for this HRESULT is: copy the media reference into a newly created static playlist and attempt the same edit there.
Closest distinction: NS_E_WMX_ITEM_TYPE_ILLEGAL rejects the object category before mutability is evaluated.
Evidence from the list model
| Capture | Why it matters for this HRESULT |
|---|---|
| Object or resource | item type, property name, load source, auto/static playlist status and access rights |
| 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
- Start from the original call and log
0xC00D1073together with its object and operation phase. - Collect item type, property name, load source, auto/static playlist status and access rights before changing the machine.
- Use this single-variable test: copy the media reference into a newly created static playlist and attempt the same edit there.
- repeat on a fresh object if the original predates a configuration, device or resource change.
- validate the expected next operation, not just initial open or object creation.
What the result means
| Retest outcome | Interpretation |
|---|---|
| Same this result 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 this result. |
| A later HRESULT appears | The rejected condition — the playlist item exists but the selected property or slot is read-only in its current representation — was cleared for this HRESULT; diagnose the new code at its own layer. |
| Only one item or endpoint fails for this HRESULT | The evidence favors resource-specific data, rights, routing or device state rather than a global Player failure. |
Actions that obscure the cause
- changing file-system permissions when the restriction belongs to the playlist object model.
- 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
- Windows Media Player SDK
- Windows Media Playlists
- Windows Media Playlist elements
- Managing playlists
- Microsoft HRESULT registry
Retain before-and-after evidence for this HRESULT so object recreation or content replacement is not mistaken for random retry success.
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