Thanks for the suggestion. I like the Greenfish Icon Editor Pro... very friendly and more intuitive to me.
Gimp made changes to the resource name within the xpm replacing the variable name with the file path name... so required a text editor to clean up the file... Greenfish dropped "const" but otherwise didn't mess up the file.
I did have a problem in Greenfish with the first file I tried -- an "access problem" I believe a segmentation problem (coding error), but it allowed me to ignore so that I could save my work.