How to Open a DMG File: 11 Steps (with Pictures)

Table of contents:

How to Open a DMG File: 11 Steps (with Pictures)
How to Open a DMG File: 11 Steps (with Pictures)

Video: How to Open a DMG File: 11 Steps (with Pictures)

Video: How to Open a DMG File: 11 Steps (with Pictures)
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This wikiHow teaches you how to open a DMG file on a Mac. Since DMG files are usually used to install applications on Mac computers, you cannot open them on Windows computers.

Step

Open DMG Files Step 1
Open DMG Files Step 1

Step 1. Double-click the DMG file

After that, the Mac will try to open it and display a pop-up message "[File name] can't be opened because it was not downloaded from the App Store".

  • If you do not see a pop-up window containing the message, continue to the "Review the DMG's contents" step at the end of this method.
  • Since DMG files are generally downloaded, you can find them in the " Downloads " folder of the Finder window.
Open DMG Files Step 2
Open DMG Files Step 2

Step 2. Click the OK button when prompted

After that, the pop-up window will close.

Open DMG Files Step 3
Open DMG Files Step 3

Step 3. Open the “Apple” menu

Macapple1
Macapple1

Click the Apple logo in the upper-left corner of the screen. After that, a drop-down menu will be displayed.

Open DMG Files Step 4
Open DMG Files Step 4

Step 4. Click System Preferences

It's at the top of the drop-down menu. After that, the “System Preferences” window will be opened.

Open DMG Files Step 5
Open DMG Files Step 5

Step 5. Click Security & Privacy

It's at the top of the “System Preferences” window.

Open DMG Files Step 6
Open DMG Files Step 6

Step 6. Click the padlock lock icon

It's in the lower-left corner of the window. After that, a pop-up window will be displayed.

Open DMG Files Step 7
Open DMG Files Step 7

Step 7. Enter the password, then click the Unlock button

You can do this in the pop-up window that appears. After entering the password, you can edit the content or entries on this page.

Open DMG Files Step 8
Open DMG Files Step 8

Step 8. Click Open Anyway

This option is to the right of the DMG file name that appears at the bottom of the page.

Open DMG Files Step 9
Open DMG Files Step 9

Step 9. Click Open when prompted

After that, the DMG file will be opened so you can view its contents and continue with the installation process.

Open DMG Files Step 10
Open DMG Files Step 10

Step 10. Review the contents of the DMG file

Usually, you use a DMG file to install the app. However, sometimes DMG files may contain photos or text files.

  • Any file that ends in an.app extension is an installable application.
  • It is possible that you may see the " Applications " icon in the DMG window. This is a shortcut to the “Applications” folder on your computer.
Open DMG Files Step 11
Open DMG Files Step 11

Step 11. Install the DMG app

Locate the icon for the application you want to install (eg Firefox), then click and drag the icon onto the " Applications " icon in the window. After that, the application loaded in the DMG file will be installed. After the installation is complete, you can search for it in the “Launchpad” menu.

You may need to click on additional options before the application is installed, depending on the application you want to install on your computer

Tips

When you double-click a DMG file on a Windows computer, you'll be prompted to select a program that can open the file. You will not be able to open DMG files unless you already have a third-party tool on your computer (eg 7-Zip or DMG Extractor)

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