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PPSX file format
This format is used to do presentations with Powerpoint 2007 and later. It has the odp format as an open equivalence.
Name : PowerPoint Microsoft Office Open XML Format Presentation
Mime : application/vnd.openxmlformats-officedocument.presentationml.presentation
Licence : Proprietary
Type : Document Diaporama
Free softwares to open ppsx : LibreOffice Impress
Non free softwares to open ppsx : Microsoft Powerpoint 2007 and later