Somewhere on first run it should ask if you wish to create associations.
To do it manually,
Settings -> Environment
Left hand pane: Select General Settings
Not sure which of these three things to do.
1. Check-mark "Check and Set file associations"
2. Click on "Set Now"
3. Click on "Manage"
Edit: Just doing 2 followed by 3 seems to work.
Edit2: I have no idea if after doing the changes whether CB needs to be restarted or not
Tim S.