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NS_E_WMPCORE_TEMP_FILE_NOT_FOUND
How to classify this WMP result
The symbolic result NS_E_WMPCORE_TEMP_FILE_NOT_FOUND narrows 0xC00D10BB to the playback core temp file not found condition: a temporary artifact created for download, conversion or staging disappeared before consumption. Keep the playback core temp file not found boundary visible when a later dialog reduces it to a general media error.
An additional test is to record temporary path, creator operation, cleanup owner and the time between creation and open; that evidence is more useful than reinstalling the Player or changing several unrelated settings at once.
What succeeds before this failure
Two rules frame this diagnosis. First, the URL, playlist item, selected source, graph and codec are distinct objects; a failure at one should not be diagnosed by replacing all of them at once. In this case, the Error and MediaError paths can queue several results, so the first specific HRESULT and its error context are more useful than the last dialog.
Representative case: A cleanup thread removes a staged file before the playback graph opens it. The example isolates only the producing component.
State worth preserving
Capture state before Player cleanup:
- Decisive check: record temporary path, creator operation, cleanup owner and the time between creation and open.
- Artifact: audio/video device identity and driver generation.
- State: ordered ErrorItem queue with errorCode, errorContext and media object.
- Object identity: Player.URL, current media sourceURL and resolved final URL.
- Underlying evidence: play state and transition immediately before failure.
- Correlation: selected graph/source/filter or codec identity and version.
Log paths, hashes, IDs, offsets, and HRESULTs. Exclude secrets and unrelated content from logs.
Reproduce without destroying evidence
- Find the first component that returned this result and label that event as this boundary.
- Freeze the input and object identity associated with the failing operation before WMP fallback or cleanup changes it.
- Reconstruct the immediately preceding successful state, then identify the call or event that crossed into failure.
- Perform the code-specific test: record temporary path, creator operation, cleanup owner and the time between creation and open.
- Make the narrow correction—correct premature cleanup or recreate the temporary artifact within the same operation generation—and repeat the same producing operation.
Related HRESULTs, different boundaries
| Result | Different boundary |
|---|---|
NS_E_WMPCORE_FILE_NOT_FOUND | The media file referenced by the playlist or library item is absent at its resolved path |
NS_E_WMPCORE_BUSY | The Player core is occupied by an operation that prevents opening or playing this item now |
NS_E_WMPCORE_MEDIA_UNAVAILABLE | The media resource is currently unavailable at its local, removable or network location |
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
Resolve this result where the relevant state is produced: correct premature cleanup or recreate the temporary artifact within the same operation generation. After correction, reload or recreate the owning object so cached failure state is not mistaken for a successful repair.
- Avoid installing broad codec packs before identifying the requested media subtype and missing component; it can destroy the artifact or state needed to explain this result.
- Avoid clearing the error queue or skipping to another playlist item before preserving the first failing media object; that can replace the original HRESULT with a secondary failure from another layer.
How to know the repair is real
Repeat the action that returned it and verify that the same object crosses the former this checkpoint. Success means reaching the next expected load, parse, playlist, control or playback state—not merely suppressing a dialog.
Practical interpretation
Use it, 0xC00D10BB and the symbolic phrase in traces. Correlate search keys with API and object.
Technical references
- Windows Media Player SDK — normative or platform material relevant to it.
- Player MediaError event — API or format context for it.
- ErrorItem object — documentation used to identify the producing boundary of it.
- Supported protocols and file types
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