Hello rollinglenn,
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!
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!
Oct 17, 2016 11:29 AM
Can't Open Iexplorer Dmg File
If so then follow these instructions to open it, install the application contained within it, and then properly store or discard the DMG file so it does not clutter your system or take up space. IExplorer is the ultimate iPhone manager. It transfers music, messages, photos, files and everything else from any iPhone, iPod, iPad or iTunes backup to any Mac or PC computer. It's lightweight, quick to install, free to try, and up to 70x faster and more resource efficient than the competition.