If necessary, send an e-mail non-file it first must be converted to a coded form that is not confusing to your mailing srever or the e-mail, which works with the recipient. There are several ways of such transformation. The best known of these two. Previously used uuencode, now the standard is base64. In most cases you need to use the second option, especially if the message transfer protocol used by MIME. However, some old elekstronnoy mail applications do not understand MIME or base 64, so it gives both ways.