The other day my boss noticed that our php pages read, and try to follow, duplicate file extentions. The pages which are displayed carry over a varying amount of the main pages attributes. The files don't exist in our remote, so we've ruled out it being a product of human error.
All of these pages show up. I can literally duplicate the extension over and over again until the end of time and it won't go to a 404 page.
I know the pages don't exist and are not being indexed.
I'm also aware of the fact that it does not effect SEO.
However I would like to make the URL resolve to a clean URL which reverts back to the actual page such as this:
I know that I need to do a rewrite, but would like some advice on the best way to go about it.