Why would Evernote want to do this? Simple the ability to index files that I use as part of my premium membership would be greatly enhanced as it would have access to more of my files other than what is current;y uploaded in Evernote directly. For the files I have uploaded including PowerPoint and PDF being able to search across them is the reason I thought of this idea in the first place. As Evernote works to promote it's Business services I would think this feature would become even more important to their success as it's the path of least resistance by allowing it's customers to index files