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When you double-click a document, macOS uses the document’s file extension to figure out which app should open the file. So, by default, a PDF file called laser-squid.pdf opens in Preview because the Finder knows that everything with a .pdf extension should open in Preview. But what if you would prefer to open .pdf files in Adobe Reader, or you want comma-separated value (.csv) text files to open in Numbers? To change any mapping, select a file of the type in question and choose File > Get Info to open the Info window.

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Apple may have discontinued its AirPort Wi-Fi base stations, but in a surprise parting gift, the company has released a firmware update to the AirPort Express that gives it AirPlay 2 capabilities like multi-room audio. If you have an AirPort Express connected to speakers through its audio jack, first use AirPort Utility on the Mac or iPhone to update its firmware to version 7.8. Once you do that, you’ll be able to play audio simultaneously through the AirPort Express and to other AirPlay 2–enabled devices, such as the HomePod and Apple TV.

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Unless you can palm a basketball, you may not be able to use an iPhone single-handed. But sometimes one hand is all you can spare. If you find yourself in such a situation, give Reachability a try. On a Touch ID–based iPhone, tap (don’t press) the Home button twice to slide the iPhone’s interface halfway down the physical screen, bringing everything into reach of your thumb. On the Face ID–equipped iPhone X, put your thumb in the bottom of the screen—about at the top edge of the Dock if you were on the Home screen—and swipe down.

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