My PC is running Windows XP SP3. For the disk image, I used the free software:
USB Image Tool 1.61
COPYRIGHT 2006-2013 Alexander Beug
http://www.alexpage.de
And edit disk image:
Free Hex Editor Neo
by HHD Software Ltd..
http://www.hhdsoftware.com/free-hex-editor
Good luck and good reading with your Kobo!
Jacques