Make a file accessible/mountable in VM (Virtualbox)

1. Create loopback device: losetup -fP /path/to/file
2. Create raw disk: VBoxManage internalcommands createrawvmdk -filename file.vmdk -rawdisk /dev/loopX
3. Check permissions, set all readable - dev and vmdk (remember to reset if not deleting)
4. Add vmdk as disk to VM
5. Use it as a block device in VM
6. losetup -d /dev/loopX