PowerPoint can save to an amazing number of file types — but it can also open 23 file types! Although that sounds like a large number of file formats, more than half that number comprise PowerPoint’s own formats that Microsoft has created over the years. And of course, they need to make sure with every release that all those formats continue to be accepted! They haven’t been that kind to non-Microsoft formats although you can still import WordPerfect outlines (yes, I was surprised to see that too!).