how to join multiple avis into one longer avi?

Internets, supposing you have used vixy.net to download an entire movie from YouTube because you don't have VHS-to-avi capabilities and it's never been released on DVD at all. Your movie is now in 6-14 annoying 10-minute-or-less avi files.

Is there a way to join them into one long avi? Help me!

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