You need to grab the files from *virt-v2v* on RHEL, not
libguestfs-winsupport. libguestfs-winsupport really has nothing to do
with anything on Fedora :)
Except that's where the files are. I had a RHEL 6.1 system without
libguestfs-winsupport and the files were missing. After installing it, the files were
there.
- Greg