MCI command messages can have extensions for specific types of MCI devices.
The extensions include additional flags for parameters and are identified by one of
the following headings in the “Parameters” section of the entry for the message:
| Animation Extensions |
Extensions for animation devices |
| CD Audio Extensions |
Extensions for compact disc audio devices |
| Sequencer Extensions |
Extensions for MIDI sequencer devices |
| Videodisc Extensions |
Extensions for videodisc player devices |
| Video Overlay Extensions |
Extensions for video overlay devices |
| Wave Audio Extensions |
Extensions for waveform audio devices |