Saving Movie Maker projects to vid file now presents 2 options: MPEG4 or WMV. I've sometimes used one, sometimes the other, but now trying to burn a DVD (in DVD Maker) it says it can't code / decode some of the files. It doesn't say which ones. Which of the MM options are compatible with DVD Maker? The old "Live" Movie Maker didn't have this problem. (I'm using Windows 7.)