| DWORD lParam1 | The following additional flags apply to compound devices: |
| MCI_OPEN_ELEMENT | Specifies that an element name is included in the lpstrElementName field of the data structure identified by lParam2. |
| MCI_OPEN_ELEMENT_ID | Specifies that the lpstrElementName field of the data structure identified by lParam2 is interpreted as a DWORD. The DWORD has meaning specific to the device. Use this flag with the MCI_OPEN_ELEMENT flag. |
| LPMCI_OPEN_PARMS lParam2 | Specifies a far pointer to the MCI_OPEN_PARMS data structure. (Devices with additional parameters might replace this data structure with a device-specific data structure.) |