While I won't say that it isn't possible, I will say that I don't think that it is possible.
Even if you add a 32x32 icon to the notifyicon icon property, it still comes out as a 16x16 icon when shown in the taskbar.
Also, the fact that I have never seen anything larger than a 16x16 icon in the taskbar lends me to believe that it isn't supported by windows.
I am sure that if it was possible, somewhere, at some time, at least one developer would have attempted to make it. My guess is that the system clock is an isolated piece from the icons in the taskbar.
J
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