[HeresJohnny]

I've been investigating the NFS problem some more and it seems that I've found a solution. Rather than it being a problem of LE it seems to be a slight incompatibility of how Windows and Linux treat NFS mount points. Windows is more forgiving, but Linux seems to have a problem if the mount point is IP based, without an alias.

My original mount point:
d:\TV-Movie -public
resulting in a path nfs://IP/d/TV-Movie

With this modification LE is able to parse the mount point as well:
d:\TV-Movie -public -name:TV-Movie
resulting in a path nfs://IP/TV-Movie

Hope this helps other users.