[ovirt-users] some ISO images not recognized

Hello everyone, I configured a test environment with 2 hosts (centos), hosted engine and NFS storage for data domain and iso domain. I noticed that windows 2012 ISOs are marked as "unknown" in iso domain and##SELECTION_END## therefore I can't attach them to virtual machines. Maybe something is wrong with my iso? I tried to do a fresh download with same result. Centos, Fedora and Windows 10 iso are working, so I think the iso domain is ok. Did someone else noticed such behaviour? Any solution? Thanks Stefano