Thanks, but I gave up. I found that I still have the .dv files in a folder called "Media." (they were under .dvdproject or something similar. Sorry, I don't have that memorized). Since those were still there I could open iMovie and import the .dv files. It is a simple case of rebuilding those bits (sort of like working from the Video_t files. PS I have an old MBP that is very slow and I haven't reformatted or done much of anything, except to keep it on life support. For kicks, I dragged the files to a flash drive, and put them on the MBP that is running El Capitan. Nope. Get a different message but still couldn't open and a drop down directed me to a different rabbit hole. :-)