Name: macOS 10.13 High Sierra Type: Mac OS X Version: macOS 10.13 or 10.12 Memory size: 3GB to 6GB ( 65% of your Ram) Virtual disk file: macOS high Sierra 10.13.vmdk; And now, you have to select “Use an exsting virtual hard disk file” and Open “macOS high Sierra. Use the Storage Tools in macOS High Sierra. The latest version of macOS Sierra has a new tool to help you clean the junk out of your Mac — just go to the menu and choose “About This Mac” and then flip over to the Storage tab. Once you are there, you can go through the new settings and enable the ones that make sense to you.

Getting the following error when trying to create a High Sierra VM.
The DMG does mount, but VirtualBox refuses to use it for a VM.
Failed to open the disk image file /Volumes/L/Software 2016/Mac OS X/10.13 High Sierra/MacOS_High_Sierra_v10.13[Developer_Beta_4]/macOS_10.13_Beta_4[17A315i].dmg.
Could not open the medium '/Volumes/L/Software 2016/Mac OS X/10.13 High Sierra/MacOS_High_Sierra_v10.13[Developer_Beta_4]/macOS_10.13_Beta_4[17A315i].dmg'.
VD: error VERR_VD_DMG_INVALID_HEADER opening image file '/Volumes/L/Software 2016/Mac OS X/10.13 High Sierra/MacOS_High_Sierra_v10.13[Developer_Beta_4]/macOS_10.13_Beta_4[17A315i].dmg' (VERR_VD_DMG_INVALID_HEADER).
Result Code:
NS_ERROR_FAILURE (0x80004005)
Component:
MediumWrap

Dmg Not Opening High Sierra Version

Interface:
IMedium {4afe423b-43e0-e9d0-82e8-ceb307940dda}
Callee:
IVirtualBox {0169423f-46b4-cde9-91af-1e9d5b6cd945}
Callee RC:

Apple High Sierra Dmg

VBOX_E_OBJECT_NOT_FOUND (0x80BB0001)