How often does it happen that, when downloading a movie, it's all separated into chunks? You don't want to open file by file when watching that movie. You want to combine all those chunks into a single avi, wmv or mpeg. Mencoder is your solution.  Try this to join 2 flash movies a.flv and b.flv into c.flv: mencoder -oac copy -ovc copy -idx -o c.flv a.flv b.flv If you want a GUI for mencoder, you should definitely try kmenc15. 96