Ensure that the cbStruct member of the ACMDRIVERDETAILS[AW] struct is
filled with a valid value before returning.
Fill the cbStruct member of the ACMDRIVERDETAILS[AW] before sending a
ACMDM_DRIVER_DETAILS message to an installed codec that might be a
native library: native ACM codecs expect cbStruct to be valid before
filling the rest of the struct with any data.