I have 80 or so old demos in .wrk and .bun files that were recorded long ago using Guitar Tracks 2.0, and I use Cubase 6 these days and would like to import all these files into it. I also have been keeping Win XP on a single PC for the sole purpose of having access to these files to back them up at some point. There are many audio parts and tracks in these files, and exporting and lining up all the parts individually would be a massive amount of work. Is that a way to export them and import them as is into Cubase, or another DAW from which I can then import them into Cubase? Thanks, - D

I don't believe a large porringer filled with anything will help.
Those are proprietary Cakewalk formats, D, containing specific information that would be meaningless to Cubase.
Your .wav files will migrate, but not the .wrk or .bun files.
I'm inclined to wonder how many of those projects you would actually want to spend time editing?
Exporting all of the .wav files as a mass exodus would be a daunting project for sure, but if done on an as needed basis, it might be tolerable.