The full story is I have a new iMac running El Capitan, and I used Boot Camp Assistant to create a partition and install Windows 10. I booted to it, installed the boot camp drivers, installed one piece of software, uninstalled a bunch of the stupid crap that Windows 10 insists on installing, ran sysprep, then rebooted into the Mac side. I ran Winclone 5.5 Pro, selected the Boot Camp partition, saved an image, made it self-extracting, and copied it into Casper. During the imaging process, it looks like it's doing something, but the boot camp partition formats as FAT instead of NTFS (despite NTFS being selected in the configuration), and no data exists on it.