I am not sure about that, but you could try Windows Movie Maker putting many videos together and merging them. If that doesn't work for you, then I suggest you converting all of the videos to a certain format.
It is just a question. Sorry for the confusion, I posted a design chalange in another forum, but accidently, I copied and pasted the title. If you are interested about the design contest please go here http://forums.digitalpoint.com/showthread.php?t=1888532