Files with the SLDX extension are associated with Microsoft PowerPoint, versions 2007 or later. PowerPoint was developed by Microsoft and is currently the leading application for creating, editing and showcasing commercial and non-commercial presentations. It is available for both Windows and Mac OS.

PowerPoint presentations contain individual pages known as "slides" which are fully customizable. These may contain text, pictures, videos, graphics and other objects that can be arranged freely within the page.

Individual slides are saved as SLDX files. However, there is no way to create SLDX files directly from PowerPoint. Adding the SLDX extension to PowerPoint presentations when saving them won’t work either because the program automatically adds the default extension also. The only way to create them is to first create XML files with the appropriate code for PowerPoint slides and change the extension to SLDX.