Sorry I wasn't too clear.
Let's say you have a video file on your computer (an AVI for instance), and you want to make it a video with music from other sources in it.
That's kind of how Windows Movie Maker is: it lets you put a video file into the program. WMM also allows you to add music and other things.
Are there any freeware programs that are like that? I was just wondering if anyone knew about them. I looked at all the freeware posts in the thread called "Freeware!" and I noticed alot of good freeware items people were using (Foxit Reader for example

)