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Unlike previous viruses, macro viruses do not infect programs; they infect documents and templates. As part of your email security practice, don't open unknown file attachments. Opening a document or template that contains a macro virus will infect your system and the virus will spread to other documents and templates you may have on your system. Some macro viruses are not harmful, but they can be annoying. However, there are some macro viruses that can be very destructive. Also, Word macro viruses can be spread across platforms; for example, the macro virus can infect files on the Windows platform, as well as files on the Macintosh platform.