If you have Windows 10 on your computer, you can install PowerPoint Mobile to view presentations.
I f you have a Microsoft account (hotmail.com, outlook.com, live.com, msn.com) or an Office 365 work or school account, you can view and edit a presentation for free in a web browser. Save the file to OneDrive or Dropbox and use PowerPoint for the web to open it.
If you don't already have a Microsoft account, you can create one for free
The free mobile versions of PowerPoint let you open presentations on your smartphone or tablet: