![]() But if you have a Time Machine backup on hand from before your problems started, restoring your Mac using a Time Machine backup may be. Ask Question Asked 3 years, 7 months ago. OS X El Capitan suddenly can't open DMG files. DMG file is usually encrypted and compressed, unlike ISO, which is an uncompressed disk image format. ![]() When opened, it mounts a virtual disk on the computer, and is normally used for installing new applications. A DMG file is essentially Apple's format for mountable disk images in Mac OS X (macOS) computers. ![]()
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