Do not
trust the icons of attachment file. (such as,
and others). Worms often
send executable files which have an icon resembling icons of picture, text
or archive files - to fool the user.
Never accept
attachments from strangers in online chat systems such as IRC, ICQ or AOL
Instant Messenger.
Avoid
downloading files from public newsgroups (Usenet news). These are often used
by virus writers to distribute their new viruses.
Never open
e-mail attachments with the file extensions VBS, SHS or PIF. These
extensions are almost never used in normal attachments but they are
frequently used by viruses and worms.
Never open
attachments with double file extensions such as NAME.BMP.EXE or NAME.TXT.VBS