When backing up the data on a CD or DVD, certain disc imaging applications save the images in the IMG file format. If you have IMG files that you want to open, you must mount the file onto a virtual optical drive. By default, Windows 8 and Windows 8.1 provides built-in support for IMG files. If you are using Windows 7, however, you must use third-party applications capable of creating a virtual drive to mount IMG files.
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Mounting IMG Files
When double-clicking an IMG file, Windows 8 and Windows 8.1 automatically creates a virtual optical drive and mounts the IMG file. Using File Explorer, double-click the virtual drive to access the contents within the IMG file. To unmount the IMG file, right-click the virtual drive icon in File Explorer, and then select Eject. On Windows 7, install either OSFMount, WinCDEmu or MagicDisc (links in Resources). When using OSFMount, open the application after installing, and then click the Mount New button to select and mount the IMG file. WinCDEmu, after installing, automtically mounts IMG files when double-clicking them. MagicDisc shows up on the system tray after installation, where you can select the Virtual CD/DVD Drive option to mount an IMG file.