So far so good regarding CasaXPS from http://www.casaxps.com/. I've been able to load .vms files, selection of the sections of spectra need to be done with the arrows or with the menu (up down etc.) - not sure if that's standard. It seems it doesn't like mouse-clicks yet. We'll see as I learn more. [Haven't used the program before, so I'm not sure what is normal for it or not.]
Standard winxps bottle, use run-command method to launch after unzipping the program folder and placing inside the ~/Library/Application Support/Crossover/.../program files/ for that bottle - seems to work ok.
Will update as I learn more.