The list of file formats that can trigger the viewer to fetch a resource over the internet is so large that it's impossible to cover them all. Unless you're wor

The list of file formats that can trigger the viewer to fetch a resource over the internet is so large that it's impossible to cover them all. Unless you're working with plain text or something you know is safe, don't open files downloaded over Tor if you're running on a standard OS (and not, say, in a whonix workstation that's isolated from direct internet connections).