Thanks John for your reply - the clips are in a separate iMovie file and I did not send separate movie and pptx files to my colleagues. I had hoped there was a way of inserting them in pptx as a free-standing doc, but do you think it will work better to supply two separate files, linking clips in the pptx to the separate AVI files? You can tell I don't have a clear understanding of how all this works...
Many thanks
Matt