The MCI_SET_PARMS structure contains information for the MCI_SET command.
typedef struct {
    DWORD dwCallback; 
    DWORD dwTimeFormat; 
    DWORD dwAudio; 
} MCI_SET_PARMS;
 When assigning data to the members of this structure, set the corresponding flags in the fdwCommand parameter of the mciSendCommand function to validate the members.
  Windows NT: Requires version 3.1 or later.
  Windows: Requires Windows 95 or later.
  Windows CE: Unsupported.
  Header: Declared in mmsystem.h.
MCI Overview, MCI Structures, MCI_SET, mciSendCommand