If this is an image file from a previous version of Windows I don't think you can.
You should use the Windows Easy Transfer Wizard to save data from a previous OS to Windows 7 if you still have the old OS installed.
Thanks for the reply Jonmor68. I did use the Transfer Wizard in Windows XP and it made the file along with three other files( IMG00002.DAT, IMG00003.DAT, Status. The Transfer Wizard if Windows 7 will not open them.