A few things, Windows Movie Maker, as stated, cannot play clips in reverse. Its a very simple editing tool and if you really cut through alot of muck there is some decent elements there, but you could easily find them in a lower priced Pinnacle system. As for the Quicktime thing, its a Windows based product, aka only Movie Files, and WMV, and a few others are supported. Mainly, you can't export clips in a different format than a compatailble windows one. Also imported clips cannot be quicktime or mpg4 and such.