Burning a DVD with WAV soundtrack?

I'm fairly new to burning DVD's and I usually use AVS to convert my .AVI file to DVD format, normally it outputs one file w/sound included. Well I had been having to use 2 DVDs because my file size would go from like 700mb to over 5g so I tried a different program this time (TPMsomething?) to limit the file size. Well this program allowed me to specify low resolution 4:3 ratio so I got the file down to just over 4g but strangely and I'm not sure if this was the program or the original input file, it separated the video file and the soundtrack to the movie. The soundtrack is in WAV format and my question is how can I (and what program should I use) to burn both the video and audio to a DVD so it will play normally in a DVD Player?

Any help or suggestions are greatly appreciated.