http://www.mp3-box.org/wav-vs-mp3-files/

How do I put a wav or mp3 soundtrack over the top of a wmv video?
I have sound problems with videos but I am ok recording audios on their own, if I record a soundless video and an audio file with separate applications but at the same time then how can I integrate these 2 files into 1 video with audio?
If these formats are no good then could you tell me some other formats that will and how to do it e.g. wma vs avi etc instead…
windows movie maker, you can drag video on top bar and sound on bottom bar. To remove audio of video right click on it and select volume.
PowerPoint 2007 Tutorial 3.2. Adding Sound and Video