If you are trying to open a file with a .prs extension (not an .exe), that is a Corel Presentations file, not a program to download. To make sure you get the right file, could you tell me:
This is a modern desktop application for professional use, commonly installed in organizational environments.
A network access client whose installation can sometimes be triggered via a browser [Download .exe] link.
Control software for CNC tools, requiring specific setup from the ShopBot website.
