How to change icon for a reappearing app. in my quicklaunch?

Hi,

I'm using TLB in a corporate environment. There is a tricky application that centrally gets put in the quicklaunch folder periodically, thus appearing in my set of icons in the TLB toolbar. There's no corresponding item neither in the startup folder nor in registry's Run key, nor it is a scheduled task in task scheduler. Magic.
If I delete its icon from the toolbar, it goes back soon. If I change it's icon to something matching my other icons, its icon gets reverted to its default. I have also tried to change its appearance from using an icon to a 3-state image, even that gets reset to the original icon.

I need some help to solve the situation somehow. Either by removing it and not allowing to reappear in my toolbar, or it can even stay there, but in that case I'd like to be able to control what icon it uses.

(Just for the record I have rather pinned that application to my startmenu and tried to ask corporate IT how to remove the icon from the quicklaunch, but of course that move would violate corporate policy, so they refused to assist.)

many thanks
szekelya