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3 steps to open file with DMG extension

Usually solving problems with DMG file is simple – just install proper software and open the file. Read the guide and open DMG file now!

  1. 1. DMG File Extension
  2. 2. What is a(n) DMG file?
  3. 3. How to open DMG file?
    1. 3.1 Install a program that supports DMG files
    2. 3.2 Find and download proper software
      1. 3.2.1 Programs that support files with DMG extension
    3. 3.3 Check the DMG file for errors
  4. 4. Similar file extensions

DMG File Extension

File
  • File type Mac OS X Disk Image
  • File developer Apple
  • File category Disk Image Files
  • File popularity rating
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What is a(n) DMG file?

The disk image file with the extension .DMG stores compressed or encrypted, raw block data saved in binary format, used primarily by software installers operating in the macOS system. The extension is a development of the archaic .IMG format used by previous generations of Apple computers.

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How to open DMG file?

There could be multiple reasons for which the system does not support given file. In the case of DMG extension, it is probable that none of the installed programs support given file type. Therefore, user should undertake the following steps

Step 1: Install a program that supports DMG files

If an application that supports DMG files is installed on user’s system, but is not used to open such files by default, right-click on the file icon and choose "Open with" option from the menu. Next, select the proper application and check the "Always use the selected application to open this kind of files" box. The system will store this information in its registry and use the selected program to open files with DMG extension by default.

Hint for Mac OS users

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For Mac OS users the procedure is analogous – open the file menu by right-clicking on the DMG file and choose "Information" option and select "Open with program" option. From the submenu select an application and click on "Change all" button.

Step 2: Find and download proper software

Inability to open DMG files may also be related to the lack of any application that supports given file being installed on the system. Should that be the case, user needs to download and install one of the following applications. Once installed, the system will automatically associate newly installed application with DMG files. If this step fails, see step 1.

Programs that support files with DMG extension

Windows programs
Windows
MAC OS programs
MAC OS
Linux programs
Linux

Step 3: Check the DMG file for errors

Sometimes, although relatively rarely, steps 1 and 2 might not lead to expected results. There can be several reasons for such situation to occur:

  • DMG file has been downloaded from the internet but for some reason it is incomplete. In such case the file should be re-downloaded and opened again.
  • Structure of given DMG file could be corrupted and as such the program is not able to open the file
  • Storage medium on which the file was stored is damaged
  • It is important to ascertain that the icon representing given file is not a shortcut a related DMG file no longer present in the location to which the shortcut points
  • If the user account has restricted access privileges it is advised to contact the system administrator or an IT expert

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