Sometimes when you create an e-mail message, you want to send along a file as well. Files sent with e-mail are called message attachments. When you send the message, the file goes along with the message so the recipient can open it on his or her computer. When you receive an e-mail attachment, you can open it directly from the message, save it to your hard drive and open it from there, or print it straight from the message to a printer. Messages that have attachments display a paper clip icon to the left of the message author’s name or below the message received date, depending on the location of the Reading Pane and the width of the display.
To open an attachment, you must have an application that supports the attached file. For example, if you receive a PowerPoint file (.ppt or .pptx), you must have PowerPoint, the PowerPoint Viewer, or some similar application installed on your system to view the file.
Some files that you receive from another user, such as programs, Web pages, and script files, can be infected with a computer virus. You should save all executable files to your system and run an antivirus program that checks the file for a virus before you open it. If you receive an attachment from someone you do not know (as happens a lot with junk e-mail), you should never open it. Just delete the message.