With a tool I heaqrd of (Starwind V2V) I was trying to convert a VHDX disk image of a virtualized Windows 2012 Server to a VMDK which I then wanted to run under VirtualBox. It turned out that I ended up in an FATAL INT18 BOOT Failur.
So I turned to VMWAre Workstation.
How could I manage to get this vmdk running under vmware player or workstation?
Make sure you select "patch OS" option. We'll convert VHDX and will put Windows stored in it into "recovery mode" so after reboot on a new virtual hardware Windows will rescan drivers and re-build storage and network stacks. After that you'll be fine Good luck and ping me if you'd have issues.