#define PUBLIC_DATA_EX( public, struct, open, update, close ) \
    PRELOAD( Data_##open##_##close ) { \
    RegisterDataTypeEx( WIDE("system/data/structs")  \
        , public, sizeof(struct)    \
    , (OpenCloseNotification)open, (OpenCloseNotification)update, (OpenCloseNotification)close ); }