Comment 11 for bug 140411

I think the situation is even worse. The taskbar stuff exists as a component in components/taskbar/Taskbar.tcl.

    switch -- [tk windowingsystem] {
        win32 {
            if {[catch {package require Winico}]} {
                return
            }
        }
        x11 {
            if {[catch {package require tktray}]} {
                return
            }
        }
        default { return }

so on Windows it uses Winico, on Unix like systems it uses tktray, and on MAC I don't know????
maybe its worth trying whether tktray works on windows too? At least as far as I can see, grepping the ./configure script of tktray for win32 actually shows sth. regarding mingw and friends. On OpenBSD I have the latest release here, tktray 1.3.8. The binary for Linux that comes with coccinella is the rather old 1.1 version, probably with that version.

Sander do you can build the tktray-1.3.8 on a Windows box, and maybe also on a MAC?