Thanks for the help! I am trying to change the icon using ruby and tk on Windows XP and Windows Server 2003. I tried: require 'tk' mymainwindow = TkRoot.new() mymainwindow.iconify mymainwindow.iconbitmap "question" Tk.mainloop() and also require 'tk' Tk.root.iconify p Tk.root.iconbitmap "question" Tk.mainloop() Neither of these examples changes the icon. -- Posted via http://www.ruby-forum.com/.