OK Dan, cool. I suppose I can make sure my system is backed up first in case I need to revert back to before the GS3 install.
I hope an uninstall will leave the .gig files alone if they are in a different location.
Gplayer, VSampler and Samplelord have demos I can try before I invest. Kontakt has a demo version, but it will not play .gig files. You have to invest $399.99 to get the version that will play .gig files.