PowerPoint files come in two formats: PPTX files are editable PowerPoint presentations and PPSX files are a view-only format intended for presentations. You can edit a PPSX file, but you must first convert it back to a PPTX format. Changing the File Extension Before trying anything else, it’s always worth seeing if you can just change the file extension. This works sometimes, although it depends on the version of Office you and your colleagues are using…. Click below to read the full story from How To Geek
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