Although .dmg is a macOS disk format, there are a number reasons of why you'd want open them on Windows computers. Here's how to get started.

Mac software used to be distributed on 3.5-inch floppy disks. Now, using the MacDisk utility, you can read them on modern Windows computers.

Integrate the Mac OS and Windows environments to make moving files back and forth easy. Those requirements define the goals I had in mind in setting up my MacBook Air.