We have found 3 software records in our database eligible for .pptx to .xls file format conversion.
Unfortunately, tt doesn't seem likely that a PowerPoint presentation (.pptx) can be converted to Excel spreadsheet (.xls) as these two document formats serve different purpose, the first one is presentatrion the second one is a spreadsheet.
You xan perhaps 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. It is unlikely some converter just for the purpose of pptx to xls conversion exists.
PPTX
Files with pptx extension are presentations from modern version of PowerPoint from Microsoft Office / Office 365. PowerPoint slide shows are basically set of screens which can include text, graphic, sounds or videos used for various presentation purposes.
XLS
Files with xls extension are best known as spreadsheets from Microsoft Excel. A spreadsheet is basically a grid of cells sorted in rows and columns. Each cell can contain text, numeric or formula data. Excel XLS spreadsheets can be opened in most other similar programs, such as OpenOffice.org Calc.