We ported nbdkit to Windows. That port is now upstream and should appear in the next stable release (1.24). There is also a new native file plugin for Windows which supports Windows files and volumes, hole punching for sparse files, querying file sparseness, and efficient zeroing.
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Richard WM Jones 
Hi Richard. A little advice welcome if you have 5 mins. Is there a windows binary download for nbdkit? Also I’m looking at mounting an NTFS vmdk image on a Windows box across a network from a linux machine, Can do an sshfs mount of the win filesystem ok and tried a guestfish mount of the vmdk file but it burped as opensuse doesn’t have the guestfs-windowssupport package (for ntfs??). Also tried a qemu-nbd mount of the vmdk but got a ro permissions error. Whats the best approach here? Thanks
Windows binaries: https://www.redhat.com/archives/libguestfs/2020-September/msg00103.html
nbdkit is a server so it won’t help with the Windows question. IFor upstream libguestfs on Linux to open an NTFS filesystem you will need the ntfs-3g package installed. This certainly works on Fedora and Debian, but I don’t know about OpenSUSE.