.MID does not play during a Presentation Conference due to not supported.
Cause:
This feature is not supported on audience machines during a presentation conference.
Solution:
Remove the .MID object from the presentation and do not use embedded multimedia objects, in future presentations that are to be given over the network as a presentation conference.
Do both of the following:
1) Remove the .MID object from the presentation.
2) Do not use .MID objects, or any other embedded multimedia objects, in future presentations that are to be given over the network as a presentation conference. NOTE: The following features can be used during a presentation conference: builds effects; transition effects; the 'Slide Navigator'; the 'blacking the screen' effect; the annotation tool (i.e., the pen); the 'Meeting Minder' (to take notes); and branching to non-shared, non-OLE, non-embedded objects, slides, or presentations.