Hi,
I burned via ImgBurn a boot cd for a windows 7 enterprise 64 bit system (as described in the imgburn guide), this means I copied the necessary files to the cd and gave the necessary information about emulation type, boot image, load segment, etc. to the imgburn tool. When I compare this cd with the "official" ms reparation cd, all files and necessary information about boot record volume, boot catalog, virtual disc are equal - there`s only an additional ISO/Joliet filesystem on the "official" cd.