Here's a short guide on opening DMG files on Windows and extracting data from them.

DiskImageMounter is the app that.dmg files are associated with, so that's not it. 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.

Nope, Didn't Work.

What To Do If Your DMG File Is Not Recognized On Your Mac

1. Download DMG Extractor (it's free).

   Once installed, DMG Extractor will run automatically.

2. Open DMG Extractor and select the DMG file you want to extract

   Click the 'Open' menu icon on the top-left of the window.

   If the DMG archive is password protected, DMG Extractor will prompt you for its password:

3. DMG Extractor will load the file you selected. If you have a large DMG file, a progress bar will show until the DMG file is loaded.

   Now you should be able to see all the files contained within the DMG file and navigate folders and files.

4. Extract the files you want

   Click 'Extract', next to the 'Open' button. You can choose whether to extract the whole of the DMG's contents into the same folder, or into a specific one chosen by you. If you don't need to extract all the files, just select the files you want and on the 'Extract' menu click 'Selected files to…'

DMG Image Not Recognized - Apple Community

That's it: extraction complete! Your selected files should now have been converted from the DMG file and saved onto your Windows computer ready for you to use.