pub unsafe extern "system" fn OpenTnefStream(
    lpvsupport: *mut c_void,
    lpstream: IStream,
    lpszstreamname: *const i8,
    ulflags: u32,
    lpmessage: IMessage,
    wkeyval: u16,
    lpptnef: *mut ITnef
) -> HRESULT
Expand description

Required features: "Win32_Devices_Tapi", "Win32_System_AddressBook", "Win32_System_Com"