What does HRESULT 0xC00D0FCD (NS_E_FILE_FAILED_CHECKS) mean?

NS_E_FILE_FAILED_CHECKS

How to classify this WMP result

NS_E_FILE_FAILED_CHECKS is HRESULT 0xC00D0FCD. At this checkpoint it means the file fails the Player library admission checks before it can be added; the result belongs to WMP file download, save and package persistence, not to an unspecified Player failure.

An additional test is to record the admission rule, file type, path and first validation result rather than only the add operation; that evidence is more useful than reinstalling the Player or changing several unrelated settings at once.

How to prove the condition

1. Preserve 0xC00D0FCD, the ErrorItem context and the object instance involved in file failed checks.
2. Compare the failing file failed checks artifact with a known-good artifact that differs only in the suspected property.
3. Separate acquisition, parsing, object construction, playback and persistence until the owner of file failed checks is clear.
4. Confirm the failure directly: record the admission rule, file type, path and first validation result rather than only the add operation.
5. After you correct the property that fails admission or leave the unsupported file outside the library, recreate the owning WMP object and verify that the corrected generation completes.

Minimum useful incident record

Capture state before Player cleanup:

• What to verify: record the admission rule, file type, path and first validation result rather than only the add operation.
• Artifact: file attributes, owner, ACL and sharing handles.
• State: bytes received/written, expected length and final hash.
• Object identity: original URL/path and final redirected or canonical location.
• Underlying evidence: HTTP status/content type or local CreateFile-style access outcome.
• Correlation: destination directory, temporary file and final rename/replace result.

Why the producing component matters

Before changing state, remember that download, parse and save are separate stages: a successful HTTP response does not prove that the payload is valid or that the destination can be committed. A second platform rule is that read-only attributes, sharing modes, redirected paths and streamed sources can prevent persistence even when playback succeeds.

Representative case: A readable file is rejected during library validation even though ordinary filesystem access succeeds.

Targeted fix

Change the responsible precondition rather than masking the symptom: correct the property that fails admission or leave the unsupported file outside the library.

• Avoid retrying save under a new name without recording the failing destination and access mode; it can destroy the artifact or state needed to explain this result.
• Avoid treating a downloaded error page as a valid playlist, skin or media package; that can replace the original HRESULT with a secondary failure from another layer.

Neighboring codes to separate

Completion criteria

Keep one fixture that reproduces 0xC00D0FCD and one corrected fixture that changes only the identified precondition.

Technical references

• Supported protocols and file types — API or format context.
• File name extensions — documentation for this result.
• Windows Media Player SDK — normative or platform material relevant to this result.
• Error handling in the WMP object model