So I disabled Norton, and unzipped the file again. This time there were four .exe files, each 8kb in size, for running the movie in various resolutions.
I double-clicked one of them. It immediately reduced the resolution of my displays, and moved/rearranged all of my open windows, putting them all onto the right-hand display. I heard music, but saw no video, and panicked and hit Alt-F4 to stop it. My display resolutions were restored, but I had to manually put all my windows back where they belonged.
Perhaps I should have trusted Norton.