If it doesn't, please don't forward it to others. When you receive suspect email, delete it immediately. These files can have a virus that will put you out of commission for a while. As a general rule, don't open ANY attachment unless you have requested it. Even if it is from a friend, they may not have been careful about where they got the attachment.
Viruses piggy back on attachments.
Merely delete it before clicking it open. You can always write to the friend and find out more about the attachment and ask them to resend it if you have questions about its importance. You might have wondered how we manage this email list. We use the free services of a company called Topica. In the next few weeks you will receive a message directly from Topica highlighting the tools and content on their site.