<A target="_blank" href="http://www.notesdesignblog.com/notesdesignblog/ndblog.nsf/dx/-opening-symphony-files-in-notes-8.5.1-or-not.htm">Mary Beth Raven says under Notes 8.5.1 you now have a choice</A> as to which application opens Symphony files. She provides a screen shot to help you see what choices you have.