Function StgCreatePropStg 

pub unsafe fn StgCreatePropStg<P0>(
    punk: P0,
    fmtid: *const GUID,
    pclsid: *const GUID,
    grfflags: u32,
    dwreserved: Option<u32>,
) -> Result<IPropertyStorage>
where
    P0: Param<IUnknown>,