I cannot remember off the bat since I havent been on OS X's control panels for a few days, but is there something like the PC exchnge control panel where you assign PeeCee extensions to apps?
Due to a bug in the Mac OS X Finder (as of Mac OS X 10.0.1), Mac OS X gets confused and will display the wrong icon for the BBEdit application or documents, launch the wrong BBEdit application when double-clicking on a document, or refuse to accept drags on to the application's icon in the dock. These symptoms will manifest if there is a copy of any pre-6.1 version of BBEdit on any mounted volume. We anticipate that this will be corrected in some future update to Mac OS X.