Dmg file is the disc image file which is widely used by Mac systems. Most of Mac operating systems and applications are distributed in dmg files. On Windows PC, it is very convenient to manipulate dmg files with PowerISO. You can open dmg file, convert it to iso file, or burn it to a CD / DVD disc. To convert it to iso file, please follow the steps, Run PowerISO. Choose "Tools > Convert" Menu. PowerISO shows Image Converter dialog. Choose the source DMG file you want to convert. Set the output file format to iso file. Choose the output file name. Click "OK" button to start converting dmg file to iso.