You received an e-mail message from a co-worker. It includes a .zip file as an attachment. The e-mail message explains that the attachment updates a critical flaw in the operating system and provides detailed instructions for installing the program. Which step should you perform first?

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You received an e-mail message from a co-worker. It includes a .zip file as an attachment. The e-mail message explains that the attachment updates a critical flaw in the operating system and provides detailed instructions for installing the program. Which step should you perform first?