There are several ways to open a presentation that was created using any version of Keynote.
To open a Keynote presentation from the Finder, do any of the following:
Double-click it.
Drag it to the Keynote application icon.
Hold down the Control key while clicking the presentation’s icon, and then choose Open.
In Keynote, choose File > Open, select the presentation, and then click Open.
If you’re using OS X Mountain Lion (v10.8), and you want to open a presentation that you have stored in iCloud, open Keynote, click iCloud at the top of the Open dialog, and then double-click it in the Open dialog.
To open a presentation you’ve recently worked on, choose File > Open Recent and choose the presentation from the submenu, or click Open Recent in the Theme Chooser, and then select the name of the file you want. Or, in the Theme Chooser, click “Open an Existing File,” locate the presentation you want in the Open dialog, and click Open.
If your computer has iCloud turned on, and you’re using Mountain Lion, you may not see the Theme Chooser. Click On My Mac at the top of the Open dialog, locate the presentation you want, and then double-click it.
If the presentation is protected by a password, double-click it, and then type the password and click OK.
If you see a message that a font or file is missing, you can still use the presentation. Keynote replaces missing fonts with a font that’s available on your computer. To restore the missing fonts to the presentation, quit Keynote and then add the fonts to your Fonts folder (for more information, click your desktop, choose Help > Help Center or Mac Help, and search for “fonts”). To make missing movies or sound files appear, add them back to the presentation as you did originally. To avoid this problem, you can save media files as part of the presentation when saving; see the details in Saving a Presentation.