You will probably have to use a video editing program to join the two. Windows Movie Maker should work for that. You won't suffer any quality loss since AVIs are uncompressed.
I don't think a simple concatenate will work since the first AVI has header information that specifies how long the movie actually is. What you'd end up with is a file that is the size of both AVIs combined, but would still only play to the end of the first movie.
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