Hive files are the undocumented binary blobs that Windows uses to
store the Windows Registry on disk.  Hivex is a library that can read
and write to these files. 
hivexsh is a shell you can use to interactively navigate a hive
binary file. 
hivexregedit lets you export and merge to the textual regedit
format. 
hivexml can be used to convert a hive file to a more useful XML
format. 
In order to get access to the hive files themselves, you can copy them
from a Windows machine.  They are usually found in
%systemroot%\system32\config.  For virtual machines we recommend
using libguestfs or guestfish to copy out these files.  libguestfs
also provides a useful high-level tool called virt-win-reg (based on
hivex technology) which can be used to query specific registry keys in
an existing Windows VM. 
For Perl bindings, see perl-hivex. 
For OCaml bindings, see ocaml-hivex-devel. 
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