Footnote 5

In case you're wondering, that "X-file's" episode was "Anasazi," the cliffhanger to the second season, wherein the Lone Gunmen discover the apocryphal report about the government's MJ-12 group (which, according to conspiracy theory, was the feds' super-secret investigation into UFOs). The document was written in Navajo, which Scully later had partially decoded by a native Navajo speaker.

And, for the record—no, I have no idea how Mulder got out of that railcar. (They never did explain that.)