If you don't want to install software, you can convert the DMG to a format Windows recognizes, like .zip .
To (Apple Disk Image), you typically mount it on macOS to access its contents or use a third-party extraction tool like 7-Zip if you are on Windows. While macOS handles these files natively, other operating systems require specialized software to "peek" into the container without a Mac environment. Understanding the DMG Format unpack dmg file