Conversions Supported from Data Type PROPVARIANT
To data types:
I1, I2, I4, I8, UI1, UI2, UI4, UI8, R4, R8, BOOL, ERROR, BSTR, STR, WSTR, BYTES, DATE, DBDATE, DBTIME, DBTIMESTAMP, FILETIME, GUID, CY, DECIMAL, NUMERIC, VARNUMERIC, VARIANT, PROPVARIANT, IDispatch, IUnknown