Opening rar files will require a free tool called 7-Zip. If you have Windows 7 or 8, the OS can open zip files without any software. Read on to find out the easiest way to unpack an archive: On the Mac and PC, software like WinZip and WinRAR easily open all kinds of archives, but they're not the simplest tools we found. These are two popular compressed file formats, which are used to reduce the amount of space files take up - very handy when you want to send a mail, or are keeping data for long term storage.Įven if you know how to open them on your computer, you might find it a little more difficult on your phone or tablet, but with the right software, it's easy to do, no matter what device you're using. If you've ever gotten a mail with a rar or zip file attached, and not been sure how to open it, then this guide can help clear up your doubts.