POTX - PowerPoint Open XML Presentation Template is a file extension that can be used to create slideshows and even presentations. You will be able to use this extension with PowerPoint, but you must already have it installed. This extension simply gives you a lot more features you can take advantage of. It consists of texts, layouts, formatting, and different default styles that are suitable for you. These types of files are also designed by companies that have a standard master slide, and company logos. You can open them up in Power Point 2007 or 2008 depending if you are using Mac or Windows.