Function FaxRegisterRoutingExtensionW 

pub unsafe extern "system" fn FaxRegisterRoutingExtensionW(
    faxhandle: HANDLE,
    extensionname: PCWSTR,
    friendlyname: PCWSTR,
    imagename: PCWSTR,
    callback: PFAX_ROUTING_INSTALLATION_CALLBACKW,
    context: *const c_void,
) -> BOOL