File Extension DMG

  • Full name
    Apple Mac OS X Disk Image Format
  • Developer
  • Popularity
Have you encountered a problem with a DMG file? Don’t you know which program opens a file with this extension? You will find all the information you need about working with a DMG file here. In the further part of this page we have added a list of programs that should open your DMG file. It is enough you choose a proper application for your operating system, download and install it.


DMG files are so-called disk image files, so image files of media such as CDs and DVDs but also simple folders and are used exclusively on Mac OSX. Dmg files can be password protected and the data can also be compressed. They are therefore gladly used for important and sensitive data as well as for the distribution of software.

Unlike opening an archive, opening a DMG file displays a new virtual drive in the Finder, which you can then access as a DVD or hard drive. In addition to individual image files, there are also split, so-called bundle images, which can consist of several files.

Since the DMG format is an Apple Mac specific format and a function of the operating system, there is no need for additional software to create and use DMG files. There are of course additional software that can read DMG files.

If a DMG file is to be used under Windows, it is possible to integrate these files as a virtual drive, for example, to extract the data with 7-zip or to convert it to another format (eg ISO) using a converter. An ISO file can then also be integrated, burned to an optical disk or "unzipped" with a program such as 7-Zip or Winrar.

However, it is not always guaranteed when extracting that every DMG file is understood, especially if the file is password protected.

Programs which can open a DMG file

How to open a DMG file? Advice and guidance

Absolutely most often appearing reason that prevents you from opening the DMG file is the lack of a proper application to support it in your operating system. It is notably the first thing you need to address. When one of the programs to support a DMG file from the list is already installed, you can try to rerun the file. The system should display a message asking you to choose a primary application to support DMG files. At this point we are looking for disk space where the application was installed in and we can link it with a DMG file. Since then, our operating system will use the selected program to support all DMG files.

Other issues

Despite the described problem with DMG there may be many more problems. If the existing operations were not effective, get involved with the following matters:

- verify that the DMG file is not damaged and that it has been downloaded or copied in whole
- verify that the file has a file extension that has not been intentionally changed (for example, if it do not contain other information than its extension suggests)
- make sure again whether the DMG file type is linked in the operating system with a proper program
- make sure that the file is not infected with a virus and you have up to date software and drivers.

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