ulParam1 (ULONG)

      This parameter can contain any of the following flags: The MCI_OPEN_ELEMENT and MCI_OPEN_MMIO flags are mutually exclusive.

      MCI_NOTIFY

        A notification message will be posted to the window specified in the hwndCallback parameter of the data structure pointed to by the pParam2 parameter. The notification will be posted when the action indicated by this message is completed or when an error occurs.
      MCI_WAIT
        Control is not to be returned until the action indicated by this message is completed or an error occurs.
      MCI_OPEN_ELEMENT
        This flag specifies that an element name is included. The element name can be that of a file or a file element in a compound file. The element name is specified in the pszElementName field of the MCI_LOAD_PARMS data structure. If the element name does not exist or is NULL, then a temporary element is created for subsequent use. (This is the equivalent of specifying the NEW keyword with the LOAD string command.) The temporary file can be made permanent by providing a name using the MCI_SAVE message.
      MCI_OPEN_MMIO
        Indicates that an MMIO handle (hmmio) is passed in the pszElementName field of the open data structure. The file must have been opened through MMIO with the ulTranslate field of the MMIOINFO data structure set to MMIO_TRANSLATEHEADER, unless a particular MCD indicates differently.
      Digital Video Extensions

      MCI_READONLY

        Opens the file in a read-only mode and prevents inadvertent changes to the file. When no changes to the file are allowed, the digital video driver can improve load and run-time performance, while allowing other devices to share the file for playback purposes.

        This flag can only be used in conjunction with the MCI_OPEN_ELEMENT flag. Specifying the MCI_READONLY flag disables support for MCI_SAVE and MCI_RECORD.

      Video Overlay Extensions

      The image contained in the file is loaded into the image device element and overwrites any image currently stored there. It can be displayed using the MCI_RESTORE command.

      The file is opened, accessed, and closed on this command.

      If the format of the image file is not recognized as either a device specific file format or a format supported by MMIO the load fails.

      Load performs an automatic set of the following values for:

      • IMAGE BITSPERPEL
      • IMAGE PELFORMAT
      • IMAGE COMPRESSION
      • IMAGE QUALITY
      • IMAGE EXTENTS
      M-Motion Overlay implementation values would be: 
      IMAGE BITSPERPEL = 21
IMAGE PELFORMAT  = yuvb
IMAGE COMPRESSION= BI_NONE
IMAGE QUALITY    = photo
IMAGE EXTENTS    = image specific

      The previous values for these attributes are ignored.

      Load also automatically sets IMAGE FILEFORMAT to indicate information about the original file.

      Waveform Audio Extensions

      MCI_READONLY

        Opens the file in a read-only mode and prevents inadvertent changes to the file. When no changes to the file are allowed, the waveform audio driver can improve load and run-time performance, while allowing other devices to share the file for playback purposes.

        This flag can only be used in conjunction with the MCI_OPEN_ELEMENT flag. Specifying the MCI_READONLY flag disables support for MCI_SAVE and MCI_RECORD.

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