When szOID_CERT_EXTENSIONS is used for the lpszStructType with CryptEncodeObject, CryptEncodeObjectEx, CryptDecodeObject, or CryptDecodeObjectEx the following details apply.
"1.3.6.1.4.1.311.2.1.14"
pvStructInfo points to a CERT_EXTENSIONS structure.
May be used for one of the attribute types in a certificate request.