I recently upgraded my Adobe CS4 Des. Standard to CS5. For some reason Adobe didn't overwrite CS4 but instead installed CS5 as a whole new series of programs. Seeing as I didn't want both CS4 & ...
I know how to change the default application for opening files. I select a file in Finder, right-click and select Get Info from the context menu. In the file's Info window, expand the Open with: ...