Is there any way (natively or via a 3rd-party tool) to do this.

In at Terminal, hdiutil imageinfo filename and look at the output for: Format: UDRO.

While your DMG is mounted, your data has vulnerability level X.

Edit Dmg File Windows Software Like Normal

Keep in mind that while disk is mounted, readonly or not, it can be accessed by any software like normal folder.

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Edit Dmg File Windows Mac Software World

DMG files are very common in the Mac software world, with most Web-downloaded software coming in DMG form.

Like a physical drive, a disk image must be mounted to access the files on it.

To edit the files on a disk image, it must be readwrite rather than read only.

In this case, you will need to re-save it in ReadWrite mode.

In the dialog box, select the virtual drive that mounted when you double-clicked the original DMG file.

You will be asked to choose a file name and destination for the new image file.

Add or remove files by dragging them to or away from the virtual drive icon.

When you have finished editing the DMG files contents, click Eject or drag it to the trash to unmount it.

The DMG file will now contain the edited files of your choice.