This article explains what a PPTX file is, what programs you can use to open a PPTX file, and how to convert a PPTX file to other presentation formats.
How to fix: PowerPoint has found a problem with the content in pptx.- Video tutorial
A PPTX file is a Microsoft PowerPoint slide show. It can contain formatted text, objects, slides, images, videos, and more.
This is the default presentation file format for PowerPoint 2007 and later. The older version of this format, used in PowerPoint 2003 and earlier, uses the PPT file extension.
If you have a PowerPoint file that you just want to view and not edit, you can do so quite easily with Microsoft's free PowerPoint Viewer program. You won't be able to edit the slides or make changes like you can with a full version of Microsoft PowerPoint, but the viewer is a lifesaver if you just want to skim through a presentation that someone sent you.