We have found 3 software records in our database eligible for .keynote to .ppsx file format conversion.
Older .keynote presentations that were saved in previous version in then iWorks Keynote ('06 or earlier) can be transformed and converted to PowerPoint presentations and slideshows (for example .ppsx). Possibly can be done even in the latest Keynote, unless something fundamentally changed, but otherwise would require older version of the program. Some 3rd party program, such as LibreOffice may also be of help here.
Updated: October 15, 2020
KEYNOTE
A keynote file extension is used for presentations saved in Apple iWork Keynote '06, or in its previous versions. Keynote is a professional presentation tool for Mac OS X, macOS and iOS.
PPSX
Files with ppsx extension are used for presentation slide shows created in the popular presentations maker Microsoft PowerPoint. PPSX format is used for complete slideshows that also may include audio or video effects.
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