Você poderia tentar o libguestfs, se você rodar o Linux:
Extraído da manpage do virt-winreg , parte de libguestfs
:
This program is only meant for simple access to the registry. If you want to do complicated things with the registry, we suggest you download the Registry hive files from the guest using libguestfs(3) or guestfish(1) and access them locally, eg. using hivex(3), hivexsh(1) or hivexregedit(1).
Veja a página de manual do hivexregedit para detalhes.
Opções alternativas aqui , com maior destaque na inicialização WinPE
e executando isso:
Run regedit,
select
HKEY_LOCAL_MACHINE
File --> "Load Hive..."
The registry files are located in
XYZ:\Windows\System32\Config
of the partition you are trying to edit.