PowerPoint 2007, 2010, and 2013 include several built-in Theme Fonts sets. Additionally, you can also create custom Theme Fonts sets from within PowerPoint — however this provides limited abilities because you can only change the fonts used for the Latin script. If your organization uses multiple scripts, or if you want to explore extra options available within the Theme Fonts specifications, you can easily edit or create your own custom Theme Fonts by editing the actual files. Yes, all Theme Fonts sets comprise a few lines of code within an Open XML file. You can open any Theme Fonts file with the .XML extension, and then edit them within a text editor such as Notepad. Save this file with a new name in a designated folder and you actually end up creating your own custom Theme Fonts set!