What's the real story?
It doesn't. At least, not like what you are thinking. As you know an encoded attachment is a series of lines like: XXHUBKJVHLSJFWSJNDL:SANFKJHSBFSLJRWKSBF DSKJNBFSHNF:LSJFLKSNFLKJSBFLK:SNFLKSNFS FJSHBFLKSHNFLKNSFL:SF:LSNFLKSNFLK:SNFL: KFSLKHFDSHNFKDNFLDKNFLKDNFLKJHDBIAVFBUB SA scans that. Of course, there is nothing there that matchesanything.