I see that your MacBook stopped opening .DMG files after you updated to macOS Sierra. I can imagine it's concerning to have something not work like it did on a previous operating system. I'm happy to help assist you in finding the best resolution.
macOS should read these files and you should be able to open them fine with no issues, so I would suggest doing a fresh restart of your computer to see if that helps.
If you still have an issue after that, try a backup of your Mac's important data and a reinstall of macOS using the following articles:
Use Time Machine to back up or restore your Mac
How to reinstall macOS
Please let us know if this helps.
Have a great day!
How To Open Dmg Files On Ipad
Oct 17, 2016 11:29 AM
The difference is that with a DMG, there is no physical storage medium. There is only the DMG file, which can be written to a hard drive, burned to a CD or DVD, or sent over the Internet. In order to work with the contents of a DMG file, you must mount the the disk image to your system. This may sound daunting, however “mounting” a DMG file.
Can You Open Dmg Files On Ipad
For example, say a DMG file isn't just storing compressed files like images and videos but is instead holding a software program. You can extract/open the DMG file in Windows using one of the programs mentioned below, but you can't actually execute the program and use it like you would another Windows application. To use the same program in. Macintosh OS X Disk Copy Disk Image File. On the Macintosh, these files are treated like a real disk. They can be created with Disk Copy, burnt to CD or mounted as a normal volume. If you have a.DMG file on a Windows PC it's likely you have a Macintosh file and you won't be able to use what is in it. I've been having trouble with my Mac since I installed Yosemite, where I open an.dmg file, and it would go to the Disk Utility, then I would have to open it from there. My MacBook running Yosemite did not do this, and would give the normal graphic to drag the file over applications to execute it. Now I've upgraded to Sierra, and I get an alert.
