I am not sure if this has cropped up before. A cursory search in /c/bug didn’t turn anything up that looked related.
I love getting links automatically for URLs: google.com, or pixls.us, or gimp.org.
Is there a list for allowed TLD’s to auto-linkify? That is, if I use a file with an extension like markdown, it gets turned into a link also: README.md (<- that is just typing a filename + extension, not an actual link I’ve created. 
Given ICANN’s predilection for stuffing the entire dictionary into the TLD space, it’s probably a losing proposition to try and whitelist actual TLDs (as an amusing note, .md is a valid ccTLD, for Moldova, so even if we did have a list of “valid” TLDs, README.md is a perfectly valid domain name, and does, in fact, exist – and resolve).
For filenames, specifically, I suggest wrapping them in backticks, which maintains the long-standing convention of monospace fonts for that sort of thing, and which prevents auto-linkification, a la README.md. Trying to educate people to mark up their links in some specific way, such as wrapping them in angle brackets, or having to include the scheme, or including a forward slash, I think are all doomed to sadness.
Sounds perfectly reasonable. 
I’ll do some community education on code-escaping filenames.
I am not sure how this is a bug report? moved it to support
We intend to crack down here in a later release. per: Restrict domain name autolinking so M.Sc and B.Sc are not auto linked
Les éléments ne sont pas parfaitement détectés dès la sortie de boîte ; il existe de nombreuses extensions de domaine (TLD) obscures, mais avec le paramètre markdown linkify tlds dans les paramètres du site, vous avez le contrôle total !