Natively, a lot of computers don’t support all file formats, and even the best Macs are no different. At some point, you might receive a collection of compressed files that you don’t know how to open. If it’s a ZIP file, macOS Sonoma will allow you to open it natively. You can’t say the same for RAR files. Both formats are used for file compression, but RAR is more efficient and provides better compression. To open this file type on a Mac, you’ll need to employ the help of a third-party app.