Boot Camp and VirtualBox raw disk support not working anymore under High Sierra?

Under (the previous) MacOS Sierra, I had a working Boot Camp partition with Windows installed and I also was able to run the Boot Camp partition as a VM under VirtualBox with VBox's raw disk support. So before I installed High Sierra, I had the highly convenient setup of being able to boot to MacOS or to boot to Windows in Boot Camp or if I just needed to quickly run a Windows program in MacOS, I can run the VBox VM which runs the BootCamp partition through a raw disk pointer file without having to reboot MacOS.

After I installed High Sierra with the new APFS filesystem, it was not working. I tried re-partitioning the Boot Camp (basically ran Boot Camp Assistant again which deleted and re-created the Windows partition) and it worked. I was able to boot into Windows but it had the inconvenience of having to get out of MacOS (reboot). When I tried to recreate the VirtualBox raw disk file, it worked but this time if wouldn't boot the Boot Camp partition giving out an "INT18" Boot Failure error. I was able to verify that the raw disk .VMDK file was created successfully because I can access the Boot Camp partition from a different VM and had full read/write support.

Can anybody please who was able to do this successfully under High Sierra explain to me what they did? Thanks in advance.