gotbletu teaches you how to mount an ISO image file in Ubuntu using AcetoneISO2. You can see what's inside a regular ISO image in Ubuntu, but not when it's 'mdf'. The program you need for this is AcetoneISO2. Start the program and at the bottom of the main window you'll see a button called mount. Click on that and choose your 'mdf' file. The program also opens and mounts 'ISO', 'nrg' 'bin' 'img' files. After you've mounted your file you go at the top of the main Ubuntu screen to Places and you'll see a new disc drive, which you can open like a regular one.