want to control WIndows VNC Servers wirth ARD 3

Hi,

i am not able to control Windows VNC Server (Ultra VNC 1.02/1.03) with ARD 3 in the local net. We use on several PC servers and PC clients UltraVNC over years.
Any idea? Apple Support can't help yet.

Is there an existing list which VNC-Softwares on PC side work with ARD 3? I don't want to change to OSX Vine. In the past i used "Chicken of VNC" to control the PC's.