Function OpenTnefStreamEx
pub unsafe fn OpenTnefStreamEx<P1, P4, P6>(
lpvsupport: *mut c_void,
lpstream: P1,
lpszstreamname: *const i8,
ulflags: u32,
lpmessage: P4,
wkeyval: u16,
lpadressbook: P6,
lpptnef: *mut Option<ITnef>,
) -> Result<()>