The link I posted above shows how a “.cs” attachment is not working, and I don’t believe that is a file type that the browser wants to “load natively”.
What’s wrong with having the javascript router start a full page load whenever it doesn’t recognize a URL? It would fix all the numerous variations we have seen of this bug and also allow forum administrators to host any kind of content they want on their domain outside of the Discourse app. It would basically just make links work again in the way that most internet users expect.
–David