I once tried to drag'n'drop, almost by accident, an avi file to Goldwave, and it worked perfectly. Though it was a while ago, and before an XP reinstallation (or two), so I can't tell exactly what my codec situation was back then. Right now I don't have Goldwave installed (haven't yet reinstalled after my latest XP reinstall), so I can't run a retest. But it's worth a shot. Goldwave is a jolly good program in any case.

Well, you could also of course use a program like BeLight (a GUI for BeSweet). It would be a program exactly for the purpose you described, unlike Goldwave which is, after all, a sound editing program, not a ripping program.