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I just solved this myself, having clicked on a related 'More Like This' link after I posted...
Mount A Dmg From Disk Utility Download
After double clicking the .dmg file in my download directory and automatically launching Disk Utility, I selected the .dmg disk image in the left-hand column. I then clicked over to the 'Restore' tab in the top-center of the Disk Utility panel.
Dec 21, 2017 This allows you to use Disk Utility to wipe your entire driveāor repartition it. Partition Drives and Format Partitions. Disk Utility shows internal drives and connected external drives (like USB drives), as well as special image files (DMG files) that you can mount and access as drives.
In the upper row of control buttons, I clicked the 'Open' icon. This was not an obvious choice because it is small and 'Open' is not the function I was seeking. If you roll-over that icon it says it is for mounting or unmounting a disk.
Mount A Dmg From Disk Utility System
The disk image then mounted on the first try AND once it was mounted the 'Open' icon name suddenly changed (greyed-out) to read: 'Mount.' A bit of an odd and elusive process but much easier than other more invasive procedures (like 'repairing permissions') to recreate that auto-mounting capability I had lost...
Mount Dmg Disk Utility
Jul 5, 2011 9:31 AM