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Windows may not show you the full name of the file: it may Hide file extensions for known file types, so you would not know that homepage.html.vbs really is dangerous. You need to stop Windows from hiding those types.
Internet Explorer may even ignore the file type (as set by the file name) and peek in the contents to decide what to do with the file, e.g. it will display HTML embedded in JPG comments. (So you cannot use IE: use Mozilla instead.)
Do not click on a file unless you are sure it is safe.
It is also possible to forge email; and in fact many recent viruses pick another address to use as the sender: you cannot rely on it to determine whose machine was infected.
Do not click on an attachment (or otherwise act upon an email) unless you expected it to be sent to you.
Paul Szabo email@example.com 22 Mar 04