Launching a PowerPoint file in Slide Show view from Sharepoint Online

Thanks for your reply, but I've tried that as well.

I originally saved my PPTX as a PPSX, because I wanted the file to launch as a PowerPoint Show.  I saved it in Kiosk mode, because I wanted my users to click the Actions Buttons in order to progress throught the slides.  Unfortunately, when I put a link to it in SharePoint, it just opens in Normal View instead of Slideshow View.  I tried embedding it, but is disables the kiosk aspect of it.

If I could just get it to launch in the desktop application in a PowerPoint show.  I've seen in other forums that you just need to add a bit of text at the end of the URL.  Something like PowerPointView=PowerPointShow, but I don't know what prefixes it.