Since I have no idea what gimp is and where it is falling down, I am of no use to you. I do know that I have had success in specifying the working directory using "Shell.Application". Search the board and try some things out.
Following Shawn's advice, you may also need to issue a GO command. Also possible that gimp needs the interpreter so you may want to give %comspec% a shot. Possibly the DOS Start command as well.
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Give a man a fish and he will be back for more. Slap him with a fish and he will go away forever.
