Hi David, I meant to copy the following observations into this thread which explains how you can work around the issue for now...
I think the current build of iTunes must be failling to unpack the video files properly. I've had another hunt around the Extras folder structure and it seems the files are detailed in...\controllers\data.js. This is the relevant section from the Batman Begins Extras:
audioLoop : { src : "audio/batmanbegins_loop.m4a", loop : true},
extras : [
{ thumb : "image_videoBox_mind.png", structure: "shaping", string : "Shaping Mind & Body", src : "batmanbegins_shapingmindbody.m4v", time: "12:49", blurb : "Examining the construction of the fight sequences. "},
{ thumb : "image_videoBox_tumbler.png", structure: "tumbler", string : "Batman: The Tumbler", src : "batmanbegins_batmantumbler.m4v", time: "13:40", blurb : "Goyer describes it as a cross between a Lamborghini and a Humvee. This featurette details it from conception to its current form."},
{ thumb : "image_videoBox_journey.png", structure: "journey", string : "Batman: The Journey Begins", src : "batmanbegins_journeybegins.m4v", time: "14:16", blurb : "Interviews with Christopher Nolan, David Goyer, Christian Bale, production designer Nathan Crowley, as well as others. "}
],
Using this it might be possible to work out what the temp files (somewhere in your ...\iTunes\iTunes Media\Downloads folder) should be called. They need to go into the videos folder.
tt2