[torstenvl]

Can you provide a real example from the wild where mailto: linked to a file for download? Because otherwise it's hard to see how that's a counterexample to the principle I articulated, which is specifically about downloading files, a function web browsers perform routinely.

[scrollaway]

magnet: links link to a file to download. Web browsers don’t handle these. ipfs as well. And plenty more …

FTP has nothing exceptional to it beyond it being a shitty, old protocol that is much more rarely used than BitTorrent.