Many of you may remember that in Mavericks even if you set Pages '09 as the default for ".pages" apps, they would open in Pages 5 if installed. In Yosemite, it appears that you can set defaults to older apps. I set all my ".pages" apps to open in Pages '09 and quit all apps. No matter which Pages file I opened, they all oped in Pages '09 and not Pages 5. Thought this was a interesting feature that may not be known.