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mciGetDriverData
 
        DWORD WINAPI mciGetDriverData(uDeviceID)
 
        Returns a pointer to the instance data associated with an MCI
        device.
 
Parameters
        UINT uDeviceID
            Specifies the MCI device ID.
 
Return value
        Returns the driver instance data. On error, returns zero. Since
        the driver data might be zero, the caller cannot verify an error
        unless the instance data is known to be non-zero
        (for example, a pointer).
 
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