Fix Adobe Acrobat Reader could not open PDF because it is either not a supported file type or because the file has been damaged error on PC.

Once you've decided on a native or alternative PDF reader to open your file and changed your Windows settings, locate the PDF file in File Explorer. Either double-click the file or right-click the ...

I use PDF Exchange Viewer for opening pdf's. Problem in Firefox is that clicking a link that should open the pdf in the viewer returns an error message from the viewer software.