You may be looking at the folders in a DVD and seen Audio and seperate Video folders. The video folder contains files with a .vob extension - this is the video and composite audio.
A search gave me http://www.ilovefreesoftware.com/11/featured/free-audio-extractor-extract-audio-from-video.html which explains five free programs to extract audio from mpeg which is, basically what the vob (Video OBject) is.
All this has nothing to do with Imgburn but may help you achieve what you asked for!
cut and paste your vob's to someother folder. Do a rename - 'wotever_01.vob' to' chapter1.mpeg' etc then try the stripping audio program on these. Decide what format audio you want first!
