The Winico extension introduces one new command called "winico" to load .ico files from the harddisk or icon resources from the
system and to set the taskbar-icon (when hitting Alt-Tab) and the icon in the caption of a Tk-toplevel. It can also display icons in
the taskbar status area. Winico is available at http://ftp.bj-ig.de/pub/tcltk/. Send bug reports to leo@bj-id.de 

-Leo Schubert