What does HRESULT 0xC00D001A (NS_E_FILE_NOT_FOUND) mean?

NS_E_FILE_NOT_FOUND

NS_E_FILE_NOT_FOUND: the failing boundary

NS_E_FILE_NOT_FOUND (0xC00D001A) means The system cannot find the file specified. The important boundary is file lookup; do not replace this result with a broader “Windows Media failed” diagnosis.

What this result proves

This code proves that the requested path could not be resolved to a file. It does not, by itself, prove a codec, permissions, network, device, or media problem outside that boundary. Preserve the first lower-level result when one exists, because later Player or Encoder errors can hide the original cause.

Evidence and focused verification

Record the exact expanded path or url-to-path mapping, current working/base directory, and service identity; verify that the same identity resolves that exact path. Keep the media object, endpoint, profile, or device identity fixed while changing only that rejected precondition. A successful retest should pass this exact boundary; a different HRESULT from a later stage is new evidence, not recurrence of NS_E_FILE_NOT_FOUND.

Technical references

• File path formats.
• Windows Media Format SDK.