ALL VIDEOS ARE .wmv files. Mac users MUST download a plug in to view them. We chose to put these videos on a DATA DVD. It MUST be played on a computer. It will not play in a conventional DVD player hooked up to a TV. The reason we chose this route is because at just over 5.5 hours in length, it would require 3 DVDs to fit it all. Also, this is a raw DVD in that there was no script. There was no outline. There was no camera person. There was no fancy editing. Chuck just turned on the video camera and talked while he rebuilt the Meyer E-60, from start to finish. AGAIN, ALL VIDEO FILES ARE IN .wmv FORMAT.