how do i extract "track03.iso"

[Darmbrand]

i've tried to extract track03.iso with isobuster, but the resolution was the same, i got track03.iso file. i don't think i've made something wrong, because isobuster allowes me only one step to do. i've a ripping guide, that tells me to do this in a dos window, but it doesen't work (when i enter the word "extract" my os tells me that the command is unknown / not found). can you tell me another way to extract track03.iso.

thanx