What does HRESULT 0xC00D1199 (NS_E_WMP_UNSUPPORTED_FORMAT) mean?

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Description:

Windows Media Player cannot play the file. The Player might not support the file type or might not support the codec that was used to compress the file.%0

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NS_E_WMP_SERVER_INACCESSIBLE	NS_E_WMP_DSHOW_UNSUPPORTED_FORMAT

NS_E_WMP_UNSUPPORTED_FORMAT

Diagnosing NS_E_WMP_UNSUPPORTED_FORMAT in the Windows Media Player playback path

NS_E_WMP_UNSUPPORTED_FORMAT (0xC00D1199) is returned when the Player could not map the file to a supported container/stream combination.

Controlled playback comparison

Freeze the current object state and collect actual file signature, extension, MIME type, stream list, codec identifiers and parser chosen.
Reproduce this result once without automatic retries or fallback applications.
Change only one precondition: probe a short standards-valid file of the same claimed format and compare parser and decoder selection.
Compare the first nested status and next Player event with the failed run.
After testing it, restore the original configuration if the change was diagnostic only.

Actions that obscure the cause

renaming the extension to a supported one.

Technical references

After remediation, a different downstream HRESULT indicates progress and should be recorded as a separate condition.

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