How to use Registry functions

I should use NTRegOpenKeyEx to read a registry key.
I got some example like:
<
require 'NT.ph';
use Win32::Registry;

$rc = NTRegOpenKeyEx ( &HKEY_LOCAL_MACHINE,
'SYSTEM\CurrentControlSet\Services\W3SVC\Parameters\Virtual Roots', &NULL,
&KEY_ALL_ACCESS, $PerlKey );
NTRegQueryValueEx( $PerlKey, '/', &NULL, $type, $HttpRoot );
>
but I have no NT.ph
- where should I found it ?
- how to install ?

Thanks in advance,
Marco


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