Open up Disk Utility and choose File > New Image > Image from Folder (or blank image if you want to make an empty DMG file you can add stuff to later). In the window that pops up, select the folder you want to encrypt and click the “Choose” button. 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. Next, delete the DMG file itself unless you have a reason for keeping it around.
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