Check out some options how Presentation pptx files might be converted to Excel xlsx format.
Home > Search converters: pptx to xlsx
Search for pptx to xlsx converter or software able to handle these file types.
It doesn't seem likely that a PowerPoint presentation (.pptx) can be converted to Excel spreadsheet (.xlsx) as these two document formats serve different purpose, which means direct pptx to xlsx conversion is unlikely.
You could of course copy the tables, text or images from a .pptx file to .xlsx when you open the presentation in PowerPoint and copy and paste what you need to to Excel, but that is not file conversion in proper sense.
Updated: June 22, 2017
Unfortunately, there is no detailed software record in the database that match this conversion.
Additional links: pptx file extension details, xlsx file extension details
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