DMG files are actually Mac OS disk image files. But before proceeding with the ways to open or view a DMG file, it is better if we have a thorough knowledge of what a DMG file exactly is. Though the installation files or compressed files it contains will not be compatible with your windows PC, yet there are some ways you can check out what it withholds. If you are an avid Mac user using a Windows PC, and suddenly find a DMG file in your windows system, you would definitely want to open it up to see what it contains. Thanks to this tool we were able to get the files on to our Windows computers without having to ask the client to re-send. We were sent a collection of files from a high-profile client and had no way of getting at the data. Trusted by What our customers are saying Still not convinced? This is what our customers have to say.