I am using cisco web iou and i want to point my chromium browser to open

" xdg-open telnet:// "

in putty or xterm. Can anyone help me. The browser shows a pop-up stating it is attempting an external protocol request but nothing else happens after i click it to open.

Is there a way i can specify that ubuntu opens xdg-open with putty. Is there any place i can edit preferred application or tell it to open such request with an application

I am using UBUNTU 12.10