Is there a small and simple utility for joining two videos and creating a new video out of it? The two videos may have different extensions like avg, flv, etc.
Movie maker is the super and there is another one called virtualDub it can
xmediarecode it is small and portable and supports most formats(audio and video).
freemake - not so small but easier to use (although it does have advanced settings)
The easiest way to do it in XP is to convert the videos to WMV and use Windows Movie Maker to make the final video.
You will want them all the same file type, or there is a good chance the video will not turn out correctly.
Sorry ha14, I didn't read your comment before posting mine...
they have to be the same resolution.
if the same format
How to combine video files in Windows Movie Maker?
otherwise there are some soft that do join with conversion read in the above link.