adding icon

Downloaded and installed a useful program not in the 
repo--ConvertAll--which comes with a set of icons, large, medium, small.
I have placed the program on the desktop, but it doesn't use an icon 
that it came packed with, but some generic one. How do
I exchange the provided icon for the generic?
Thanx--doug

-- 
Blessed are the peacemakers..for they shall be shot at from both sides. --A.M.Greeley

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