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NS_E_WMPCORE_MISMATCHED_RUNTIME
Where the Player stopped
The symbolic result NS_E_WMPCORE_MISMATCHED_RUNTIME narrows 0xC00D10B0 to the playback core mismatched runtime condition: the media was produced for, or parsed against, a runtime contract incompatible with the active WMP core. Keep the playback core mismatched runtime boundary visible when a later dialog reduces it to a general media error.
An additional test is to record file/runtime version markers, Player build and the component that selected the incompatible path; that evidence is more useful than reinstalling the Player or changing several unrelated settings at once.
State worth preserving
Capture state before Player cleanup:
- What to verify: record file/runtime version markers, Player build and the component that selected the incompatible path.
- Artifact: play state and transition immediately before failure.
- State: selected graph/source/filter or codec identity and version.
- Object identity: audio/video device identity and driver generation.
- Underlying evidence: ordered ErrorItem queue with errorCode, errorContext and media object.
- Correlation: Player.URL, current media sourceURL and resolved final URL.
Reproduce without destroying evidence
- Preserve
0xC00D10B0, the ErrorItem context and the object instance involved in the failing operation. - After you use a compatible runtime/component or regenerate the artifact for the installed Player contract, recreate the owning WMP object and verify that the corrected generation completes.
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 file is structurally readable, but version-specific data sends the core into a runtime path it cannot honor.
Related HRESULTs with different meanings
| Result | Different condition |
|---|---|
NS_E_WMPCORE_VIDEO_TRANSFORM_FILTER_INSERTION | The core cannot insert the video transform used for display adjustments into the current graph |
NS_E_WMPCORE_MEDIA_UNAVAILABLE | The media resource is currently unavailable at its local, removable or network location |
NS_E_WMPCORE_USER_CANCEL | The operation stopped because the user or host cancellation path was invoked |
Recovery at the right layer
Change the responsible precondition rather than masking the symptom: use a compatible runtime/component or regenerate the artifact for the installed Player contract.
- 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
Keep one fixture that reproduces 0xC00D10B0 and one corrected fixture that changes only the identified precondition.
Technical references
- Windows Media Player SDK — API or format context.
- Player MediaError event — documentation for this result.
- ErrorItem object — normative or platform material relevant to this result.
- Supported protocols and file types
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