I installed GimpPortable in \System\Apps\GimpPortable.
Clicking on GimpPortable.exe launches the program fine.
Used Shortcut Creator to create a shortcut, but clicking the icon returns this message:
"An error occurred while trying to start the selected program."
Tried to "update" the GIMP shortcut, assuming I had made an error in the path.
SC created a second shortcut that also doesn't work.
Tried to uninstall both instances and get the message:
"Uninstall of GIMP.u3p failed."