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NS_E_ASX_INVALIDFORMAT
Understanding NS_E_ASX_INVALIDFORMAT in a Windows Media playlist
NS_E_ASX_INVALIDFORMAT (0xC00D1069) is returned when the ASX metafile parser rejected the document structure rather than a referenced media URL.
For NS_E_ASX_INVALIDFORMAT, distinguish in-memory Playlist state, WPL or ASX parsing, nested-list expansion, Media-object resolution and execution of referenced items. NS_E_ASX_INVALIDFORMAT identifies a narrower stage than the dialog text exposes, so preserve its operation before trying a workaround. In this case the rejected checkpoint is the ASX metafile parser rejected the document structure rather than a referenced media URL.
Playlist boundary
AllStat already supplies the standard user-facing description for NS_E_ASX_INVALIDFORMAT; 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 NS_E_ASX_INVALIDFORMAT operation is valid.
Case-specific checkpoint: the exact ASX text, XML line and column, root ASX element, ENTRY/REF nesting and character encoding. The controlled comparison for NS_E_ASX_INVALIDFORMAT is: reduce the document to ASX plus one ENTRY containing one REF, then add elements back until the parser fails.
Closest distinction: NS_E_URLLIST_INVALIDFORMAT concerns a URL-list representation; it does not prove that ASX XML itself was parsed.
Evidence from the list model
| Capture | Why it matters for NS_E_ASX_INVALIDFORMAT |
|---|---|
| Object or resource | the exact ASX text, XML line and column, root ASX element, ENTRY/REF nesting and character encoding |
| State snapshot | Record the Player openState/playState or operation phase, object identity and exact timestamp when NS_E_ASX_INVALIDFORMAT was returned. |
| First lower result | Keep the earliest Win32, Winsock, COM, parser, codec, DRM or device result that appears before NS_E_ASX_INVALIDFORMAT. |
| Comparison record | For NS_E_ASX_INVALIDFORMAT, use one known-good case that follows the same API, protocol and component path while changing only the rejected precondition. |
Minimal playlist experiment
- Freeze the current object state and collect the exact ASX text, XML line and column, root ASX element, ENTRY/REF nesting and character encoding.
- Reproduce
NS_E_ASX_INVALIDFORMATonce without automatic retries or fallback applications. - Change only one precondition: reduce the document to ASX plus one ENTRY containing one REF, then add elements back until the parser fails.
- For
NS_E_ASX_INVALIDFORMAT, compare the first nested status and next Player event with the failed run. - After testing
NS_E_ASX_INVALIDFORMAT, restore the original configuration if the change was diagnostic only.
What the result means
| Retest outcome | Interpretation |
|---|---|
| Same NS_E_ASX_INVALIDFORMAT on the same object | For NS_E_ASX_INVALIDFORMAT, 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 NS_E_ASX_INVALIDFORMAT. |
| A later HRESULT appears | The rejected condition — the ASX metafile parser rejected the document structure rather than a referenced media URL — was cleared for NS_E_ASX_INVALIDFORMAT; diagnose the new code at its own layer. |
| Only one item or endpoint fails for NS_E_ASX_INVALIDFORMAT | For NS_E_ASX_INVALIDFORMAT, the evidence favors resource-specific data, rights, routing or device state rather than a global Player failure. |
Actions that obscure the cause
- testing only the media URL outside the metafile.
- Do not discard the first
NS_E_ASX_INVALIDFORMAToccurrence by repeatedly invoking Play, open, save or retry; later events can replace its original state. - For
NS_E_ASX_INVALIDFORMAT, 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
After NS_E_ASX_INVALIDFORMAT, a different downstream HRESULT is progress and should be recorded as a separate condition.
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