Although you are wise not to open email attachments you are not expecting (even when sent from someone you know), sometimes an attachment needs to be opened. The most reliable way to deal with attachments is to download and save them to your computer, rather then opening them on the fly. Be sure to remember where in your folder structure you saved the file, because you now need to click on it to open it. If you do not have the right software to open the attachment, your operating system will guide you through choosing one. When you encounter a file extension that is new to you, you can look it up at FILExt.com.