I had to join some .mov - Quicktime files in order to use another low cost (actually free) editor that would only allow 3 video files. This one is free and will join 3 at a time - but you can combine them to make a longer one later. I kept combining until I got up to about 10 joined.
Click try rather than register to use the free version of Movie Joiner. Other things I have not tried there as well. This one works with many formats I read -- I only use .mov
http://www.movietoolbox.com/
Thanks Glenn- another valuable resourse from you. I have downloaded the joiner, and there's lots of other good stuff here, as well. Forum won't load, though- maybe it's not running now.
I didn't try the forum but Joiner made my garden video possible -- couldn't have done it without paying money otherwise. :)