Quick Time and Viewing tiff-files in UR

[jschrot]

My standard application to view tiff-files is Black Ice Tiff Viewer (which has a TIFF Viewer Web Browser Plug-In for viewing tiff-files). UR used to use this plug-in to display tiff-files in the internal browser view. But since I installed iTunes UR uses Quick Time to display tiff-files which is very annoying because now I can only view the first page in multi-page tiff-files.
How can I prevent UR using Quick Time to view tiff-files?
(Windows Vista DOES show Black Ice Tiff Viewer as the
standard application to open tiff-files!)