It can be compared with ISO files found on windows devices. One such format is DMG, which is a MacOS disk image file. There is a wide variety of formats for each type of file. 4.15 10 Easy Way Do Split-Screen on MacĭMG: What is DMG File and How to Open DMG File.4.11 Best 12 Alternatives to CleanMyMac.2.7 Use QuickTime to Record Screen on Mac.1.26 Toast Titanium Alternative for Mac.