On Wed, Feb 16, 2022 at 01:51:51PM +0100, Gottschalk wrote: It should be straightforward. ISTR it's a kernel module, so it should just work. Once the kernel on the host has been updated, libguestfs will pull in the kernel module into the libguestfs appliance, and in theory ReFS filesystems would be immediately mountable. If their software also has extra tools - for example mount.refs to create filesystems - then a small change would need to be made in /usr/lib64/guestfs/supermin.d to copy those tools into the appliance. But this should also be straightforward. Does it come with tools? Are they packaged as a distro package? I'm not so interested in talking about proprietary software with them. I can give general advice however. Rich. -- Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones Read my programming and virtualization blog: http://rwmj.wordpress.com virt-top is 'top' for virtual machines. Tiny program with many powerful monitoring features, net stats, disk stats, logging, etc. http://people.redhat.com/~rjones/virt-top