When you download an app or a piece of software on your Mac, the file is usually downloaded as a DMG file. DMG files serve as containers for apps in macOS. You just need to double-click the downloaded DMG file, drag the app to the Applications folder, then unmount the installer. This way, the installation process has been simplified and users don’t have to suffer the hassle of installation wizards that are plaguing Windows users.

Although the installation process sounds simple, it is much more complicated than that. The contents of the DMG goes through a checksum process to verify that the file is 100% intact and that it hasn’t been tampered with. Once the file has been verified, it is then decompressed. DMG files are designed for macOS and you can’t run them on Windows devices.

A DMG file is a Mac OS X system disk image file. Just as the ISO file use in Windows system installations, the files with DMG extension also use on Mac systems. Apple Mac OS X uses the files with.dmg extensions to install a software. If we explain what is the DMG file briefly, the DMG file extension only is used on the Apple MacOS systems. Jun 26, 2018 DMG files are macOS disk image files. They are much like ISO files—their Windows-based counterpart. These disk images normally contain program installation files for macOS apps, but they can also be used to hold compressed files. DMG is Mac OS X native disk image format while virtual machines (VmWare, Parallels or VirtualBox) are able to mount ISO images only. With AnyToISO program you can convert DMG to ISO and mount the resulting ISO image to your virtual machine (running Mac OS X). The DMG file is a kind of disk image file of macOS and mounted by macOS as it were a hard drive. It can contain application installers and is often used to distribute software over the Internet on Mac. Install Programs from DMG Files on Mac Open the DMG File.

DMG files make app installations on macOS a lot quicker and easier. However, there have been several reports from users about the .dmg file not opening on Mac. There are different versions to this error, but the end scenario is the same: for some reason, users are unable to open the .dmg file on Mac. This guide will discuss why some users have trouble opening a DMG file and how to resolve this issue.

Unable to Open .DMG File on Mac

Installing a DMG file on Mac should be as easy as double-clicking the file and dragging the app to the Applications folder. However, the process is not as smooth for some Mac users because they are not able to open the DMG file to start with. According to user reports, the download process was completed and there were no issues with unzipping. But when it comes to opening the unzipped files, nothing happens. Some users who encounter this issue get the resource temporarily unavailable error while others noted no activity happening no matter how many times the file is clicked.

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Others encounter this error message when opening the DMG file:

There is no default application specified to open the document.

When the user tries to open it, either the options are grayed out or nothing happens when any of the options are clicked. This error has caused the affected Mac users to be frustrated. The users who encountered this error tried to redownload the file using a different Mac and the DMG file seems to be working fine, which means that the problem lies with the device itself. But what causes DMG files to not open on Mac?

Why Your .DMG File Is Not Opening on Mac

Some users noted that they cannot open the .dmg file on Mac after updating to Catalina, but there are also those who encountered this error when running an older version of macOS. This means that the problem is not unique to Catalina but it is something that affects the entire macOS system.

Here are some of the possible reasons why some users are having trouble opening DMG files:

• If your Mac is running Catalina, check the version of the app you are trying to open. Catalina no longer supports 32-bit apps. So if you’re trying to download and install a 32-bit app, then you might not be able to install it on Catalina.
• If you have poor or unstable internet connection, it is possible that the file was not downloaded completely, resulting in errors when accessing the file.
• If you downloaded the file from an untrustworthy source, it might be a fake DMG file or it could be loaded with malware.
• It is also likely that the DMG file you downloaded is corrupted. An interrupted download process and malware infection are the two leading causes of file corruption.

Hence, before you start the troubleshooting process, here are some things you need to consider:

• Download the file once again using a different internet connection. Try using a wired connection if possible.
• Scan the file for malware infection, especially if the file was downloaded from an untrustworthy source.
• Download the file from another source. If the app is not available on the Mac App Store, visit the developer’s website and download the installer from there instead.
• If you’re running macOS Catalina, make sure that you are downloading the 64-bit version of the app.

How to Open .DMG File on Mac

If you’re having trouble opening the DMG file on Mac, here are some of the things you can do:

Method #1. Use DiskImageMounter.

1. After downloading the DMG file, right-click or Command + click on the file.
2. Choose Open With from the menu, then select DiskImageMounter.
3. Depending on the size of your file, you should see the mounted Disk Image appear on your Desktop.
4. If you don’t see the Disk Image, choose Other from the right-click menu.
5. Navigate to /System/Library/CoreServices/DiskImageMounter.app
6. The DMG file should now be mounted.

Method #2. Mount the .DMG File via Terminal

If the right-click menu is grayed out or nothing happens when you click any of the Open With options, you can try mounting the file using Terminal instead. Drag the file to the Desktop and follow the steps below:

1. Open the Terminal app by going to Finder > Applications > Utilities.
2. In the Terminal window, type in the following command and press Enter: cd ~/Desktop
3. Next, type in this command, then press Enter: hdiutil attach filename.dmg
4. Replace filename.dmg with the actual .dmg file name.
5. After executing the two command lines, your .dmg file will now be mounted on your Mac.

Method #3: Use a Third-Party Tool.

If you cannot open the DMG file using the two methods above, you can try using a third-party utility instead. Here are some of the apps you can try:

Dmg Runners

Summary

Installing applications on macOS is a lot simpler compared to installing programs on Windows, thanks to the DMG file. However, it is normal to run into errors when opening a DMG file, especially if the file has been corrupted or has not been completely downloaded on your device. If this is the case, you can try any of the three methods listed above to open the problematic DMG file.

DMG file format is one of the most well-known container format to distribute and compress software on Mac operating system. You can compare DMG files with ISO files in Windows computers. The only difference is DMG is compatible with Mac computers and ISO is compatible with Windows computers.

It is the most popular file format to install Mac or Windows operating system these days. However, if you try to run DMG files on Windows, it will not be compatible and no application in Windows can run it. Nevertheless, if you convert the DMG file to ISO file format then you can easily extract all the files from that ISO image on Windows computers.

Dmg Runner

Reasons to Convert DMG to ISO:

1. DMG is not compatible with Windows operating system.
2. Any Windows operating system can extract files from ISO image.
3. Install operating systems or software on DMG files in Windows computers.
4. ISO files gives more options to operate with in Windows systems.

In this tutorial, we will show you two efficient ways to convert DMG to ISO image files so that you can run them in Windows operating system.

Method: Convert DMG to ISO with Command Prompt

In this method, we will be combining dmd2img tool with command prompt app to convert DMG to ISO file format. It is a bit complicated but if you follow the below instructions correctly then you will surely be able to accomplish this.

Step 1. Launch your favorite browser and open http://vu1tur.eu.org/tools/

Step 2. Download the dmg2img tool by clicking on “win32 binary” link.

Step 3. After downloading the zipped file, right click on it and choose “Extract All…” from the given options.

Step 4. Now, press Shift and make a right click together on the folder where you have extracted the files to open the command prompt window.

Step 5. Click dmg2img.exe file and type the following command line on the command prompt window and press Enter.

dmg2img <source file.dmg> <destination file.iso>

For example, if want to convert a DMG file named as abcdef.dmg then type the following command line

dmg2img “C:UsersAdministratorDesktopabcde.dmg”

“C:UsersAdministratorDocumentsconvertabcde.iso”

Step 6. After you have hit enter, the file will be converter in no time.

Step 7. You may now burn the ISO image on your Windows operating system without any issue.

Conclusion –

Converting DMG to ISO could be challenging if you don’t know how to do it properly. However, in this guide we have shown two amazing ways to accomplish this without damaging the original DMG file. Remember, if you are using Mac then DMG file is enough to install apps and operating systems, but in Windows systems, you will have to convert the DMG to ISO in order to make it usable. It is suggested that you download and copy the DMG file on your Windows computer first then perform the above methods to convert it.