Couldn’t Mount File, The disk image isn’t initialized Press Win+X and choose the Disk Management option. Choose the Action tab. Select the Attach VHD option.

Honestly I was surprised at how difficult that was to upgrade a Win 7 Home system with an IMG file purchased through my University. I don't know what they expect the average populous to do ...

IDG Disk images are automatically excluded from Time Machine backups. In order to back them up, Time Machine has to copy the disk image file.