$begingroup$ Similar to what said, I think this answer would be improved by reducing the list of abbreviations to those of the official rulebooks - DMG, PHB, MM, VGtM, SCAG, MToF, XGtE and EE. Software that will open, convert or fix DMG files dmg file extension for database dump files that are stored a binary file format. The Oracle export and import utility, used by Oracle databases, also uses the. These files are often used by software installers that download applications from the Internet to a user's computer. dmg files may be encrypted in addition to being compressed, for added file security. They often contain raw blocks of data that are usually compressed for easier file management. These files can be created with Disk Copy, burned to a CD or even mounted as a normal volume on Macintosh computers. dmg File TypeĭMG files are files that are treated like actual hard disks by the Macintosh OS X operating system. Did your computer fail to open a DMG file? We explain what DMG files are and recommend software that we know can open or convert your DMG files.