The page for GIMP portable states that it can easily be run from a CD by just running it once and then burning it to CD. This doesn't work though, because GIMP can't get a functional swap file with this method. I tried changing the path of the swap file to a Desktop folder in "preferences" but it just makes an absolute path that doesn't work across computers. I also tried messing with gimprc but I can't find a way to create a relative path swap file for multiple users/computers. When I run GIMP, it always seems to interpret the gimprc swap path as relative to the GIMP install on the CD. I'm using windows 7.