To answer "why".....the original presentation was done on a Mac and runs just fine on that computer. I would have left it alone were it mine, but........This is going to be displayed on an Intel Stick (connected to a TV) which does not have Power Point. The Power Point viewer did not operate very well with this particular presentation (loads of uncompressed videos and images). To reduce the cost, I suggested that they just run this as a video instead of needing to purchase Power Point (I believe that the no-license version of Office 365 will still allow you to play slideshows, but I didn't want to have to deal with the troubleshooting). We just converted to video and ran it from VLC instead which is working fine so far.