You can configure to present up to four custom ACPI tables to the guest. Use a command such as the following to configure custom ACPI tables. Note that CustomTable1, CustomTable2, and CustomTable3 are available in addition to CustomTable0.

$ VBoxManage setextradata VM-name \
"VBoxInternal/Devices/acpi/0/Config/CustomTable0" "/path-to-table.bin"

Configuring custom ACPI tables can for example avoid the need for asking for a new product key on Windows Vista, Windows 7, Windows 8 and later guests. On Linux hosts, one of the system's ACPI tables can be read from /sys/firmware/acpi/tables/.