2.2.2.4 Open Reply PDU (MSG_SNDIN_OPEN_REPLY)
The Open Reply PDU is sent by the client to convey the result of an attempt to open the audio capture device.
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Header (1 byte): A SNDIN_PDU header (section 2.2.1). The MessageId field of the SNDIN_PDU header MUST be set to MSG_SNDIN_OPEN_REPLY (0x04).
Result (4 bytes): An HRESULT containing the status of the attempt to open the client-side Wave Capture Device.