[Eric Brunel] writes, on news:comp.lang.tcl ,

Since I just spent half an hour to figure out how this works, I thought
someone might be interested. The exact syntax is:
 wm iconbitmap <window> <icoFileName>
and not:
 wm iconbitmap <window> @<icoFileName>
(the "regular" bitmap files required the "@" in front of them and the manual is a tad unclear on this point...).

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