typedef struct tagMCI_OVLY_RECT_PARMS {
    DWORD_PTR   dwCallback;
#ifdef MCI_USE_OFFEXT
    POINT   ptOffset;
    POINT   ptExtent;
#else   
    RECT    rc;
#endif  
} MCI_OVLY_RECT_PARMS, *PMCI_OVLY_RECT_PARMS, FAR * LPMCI_OVLY_RECT_PARMS;