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In addition to offering decent levels of compression, DMG files also support 128- and 256-bit AES encryption, which means you can make a compressed folder that’s password protected. Yes, you can, and doing so is more useful than you might think. If you want to convert the DMG to a different compressed format (like ISO, which is much like the DMG file format for Windows), a tool like dmg2img will get the job done. But, if you need to get one open, 7-Zip has support for extracting DMGs. There’s not much reason you’d want to use DMG files in Windows since they usually contain macOS apps and not Windows apps.
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Next, delete the DMG file itself unless you have a reason for keeping it around. Clicking either one of these opens the DMG file. The DMG mounts in two places: on your desktop and in the Finder sidebar under your hard drive. All you really need to do is double-click the DMG file to open it and mount it to your Mac. Well, luckily macOS does an excellent job of making everything easy. RELATED: Benchmarked: What's the Best File Compression Format? So How Do I Use DMG Files? Saving your data usage on downloads is always a good thing. And that’s second reason why macOS uses DMG files: they’re a compressed format (like a ZIP file) that makes your download smaller. This little window first goes through a phase of verifying the file, and then once it’s sure the file is good, moves on to decompressing it. This is what you see when the file is opening: DMG files include something called a checksum, which basically verifies that the file is 100% intact. The main reason macOS uses DMG files is to make sure the file downloaded properly and wasn’t tampered with.