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NS_E_WALKER_USAGE
What NS_E_WALKER_USAGE means
NS_E_WALKER_USAGE (0xC00D004E) means Windows Media Services rejected a file-walker operation because the parser was invoked with invalid arguments, ordering, or state.
Evidence to preserve
Record the walker implementation, method, input path/stream, parameters, and the successful parser operations immediately preceding the rejection.
Interpretation
A parser can be installed and capable of recognizing the media yet still reject an invalid lifecycle call. Component presence alone therefore does not clear this result.
Recovery and verification
Reconstruct the documented parser call sequence, reacquire the walker if its state is stale, and repeat the smallest operation that previously failed.
Technical references
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