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This wikiHow teaches you how to open DMG files on a Mac. DMG files are mainly used to install applications on Mac, so you won’t be able to open them properly on Windows computers.
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Double-click the DMG file. After trying to open the file, your Mac will display the message “[Filename] can’t be opened because it was not downloaded from the App Store.” (Unable to open because the file was not downloaded from the App Store).
- If this window does not pop up, continue to the “Review the contents of the DMG file” step near the bottom of this section.
- Since DMG files are usually downloaded and not available on your computer, you’ll need to open the “Downloads” folder in Finder to find them.
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Click OK when the option appears. The window will close.
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Open the Apple menu
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. Click the Apple logo in the upper left corner of the screen. A menu will drop down.
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Click System Preferences . This option is at the top of the drop-down menu. The System Preferences window will open.
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Click Security & Privacy. This option is near the top of the System Preferences window.
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Click the padlock icon in the upper-left corner of the window. A window will pop up.
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Enter the password and then click Unlock . Enter your password in the pop-up to edit the entries on this page.
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Click Open Anyway . This option is located to the right of the DMG file name at the bottom of the page.
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Click Open when prompted. The DMG file will open, now you can see what’s inside and continue with the installation.
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Review the contents of the DMG file. Usually you will use the DMG file to install the application. However, some DMG files also contain images or text files.
- Any file with the .app extension is an installable application.
- The “Applications” icon will show up in the DMG window. This is the shortcut to go to your Mac’s Applications folder.
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Install the application of the DMG file. Find the icon of the application you are installing (for example, Firefox), then click and drag it to the “Applications” icon on the window. The application of the DMG file will begin to install; Once done, you’ll find the app in the Launchpad menu.
- Depending on the specific application, you may need to click through additional options before the installation begins.
Advice
- When double-clicking a DMG file on a Windows computer, the system will prompt you to choose a program to open the file. The computer must have a third-party tool pre-installed such as 7-Zip or DMG Extractor, otherwise you will not be able to open the DMG file.
- If this method doesn’t work, you can also go to Disk Utility > Add Disk Image.
Warning
- Use caution when installing unapproved software on Mac. Similar to apps that are not available on the App Store, unapproved software has the potential to be infected.
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This article is co-authored by a team of editors and trained researchers who confirm the accuracy and completeness of the article.
The wikiHow Content Management team carefully monitors the work of editors to ensure that every article is up to a high standard of quality.
This article has been viewed 3,492 times.
This wikiHow teaches you how to open DMG files on a Mac. DMG files are mainly used to install applications on Mac, so you won’t be able to open them properly on Windows computers.
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