PowerPoint presentations typically aren’t one-shot deals. You create a presentation file, work on it a while, save it, and close it. Tomorrow you’ll return and work some more on the presentation, invite feedback from others, and maybe work on the animations. This means that you’ll often be opening the same file—one you’ve already worked on—multiple times. You can easily open an existing presentation from the PowerPoint 2013 Start screen or by choosing Open from the Backstage view.
Click the File tab to display the Backstage view.
Choose the location at which your file is located.
Click the folder that you want to access.
When the Open dialog box appears, click the file ...