I have a Seagate external hard drive and recently transferred the contents of my old computer to this drive in order to transfer them to my new computer. When I try to access the files from the external hard drive all I get are dat files e.g. IMG0002 which I cannot open. I tried downloading a free file viewer in the hopes that I could view files but no luck. Does anyone have any suggestions. The old computer ran Windows XP and this new one runs Windows 7. Thank you.