Norton Ghost Help

Hello, I have an image of my Windows 7 64 Ultimate spanning 31 .ghs and 1 .gho (around 124gb) files made using either Ghost 11 or 11.5. When I run 11.5 in a WIndows PE boot environment, ghost says that it is not a ghost file or is not the correct span segment. My image was created on a 500GB FAT32 portable harddrive and was moved to a NTFS drive and is now back on the same FAT32 drive for storage. Also Ghost Explorer says that its not a Ghost image file. Can anyone help?