To open or view either type of file, you’ll have to have PowerPoint or a PowerPoint Viewer on your system. The files differ only in one respect: PPS files open directly into PowerPoint’s slide show player, while PPT files open in the PowerPoint editor. Most finalized presentations are saved as PPS files so people viewing them don’t have to go through any extra steps to view the presentation as it was intended.
To view your relative .PPS presentations you need to download a Microsoft FREE PowerPoint viewer
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