I installed VirtualBox-5.1.4-110228-Win on Windows 10.
I disabled the Oracle_VM_VirtualBox_Extension_Pack-5.1.4-110228 extension, as found in VirtualBox Manual 9.8.1. Custom VESA resolutions.
I tried: VBoxManage setextradata "W5P32FR-ISO" "CustomVideoMode1" "2560x1600x32".
Code: Select all
C:\Program Files\Oracle\VirtualBox>VBoxManage getextradata "W5P32FR-ISO" "CustomVideoMode1"
Value: 2560x1600x32