Conversion of oxps files to ppt file format

OXPS documents can be only created in Windows 8/10. Your best shot is to first convert oxps to xps, which is a little more supported format. Once you have the XPS you need to use of the XPS conversion tools to try to export it as PPTX, or more possible PPT presentation which you could work with. Sometimes you would need to convert xps to pdf first before finally converting it to the format you need.

Open OXPS file    Open PPT file