Ultimate Unwrap doesnt recognize b3d

I have installed the plugin from the UU3D website into the plugins folder of UU3d. When I start it up and try to open a b3d file it doesnt recognise it. Its not in the menu as supported nor does it show up when i click plugins to view the plugins currently installed. I have uninstalled and reinstalled unwrap but no joy. Can anyone help?

I have noticed the same problem when Plugin and Application versions differ.. make sure you update both first :)