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Changing a Registry Value with a Machine Unique Key

Novell Cool Solutions: Trench
By Bradford Thorpe

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Posted: 16 Nov 2001

Current version: ZENworks for Desktops 3.2

I was recently asked if I could change the WINS IP on all statically IP coded machines. The WINS IP is a registry value under a key containing a GUID unique for the machine, ie:

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\ Services\NetBT\Parameters\Interfaces\ Tcpip_{0A4E0998-1952-450C-A6F0-53525083C9DE}]

ZEN cannot dynamically access a unique key but, not one to give up, I found that the GUID is actually a registry value elsewhere:

HKLM\SOFTWARE\Microsoft\Windows NT\ CurrentVersion\NetworkCards\1\serviceName

That gives me something ZEN can use, so that's when I figured this was possible.

I exported the registry value of the GUID into a text file using reg.exe (nic.txt):

REG_SZ %09serviceName%09{0A4E0998-1952-450C-A6F0-53525083C9DE}

I then ran utility called mtr.exe on this to leave me just the GUID in a text file (GUID.txt):


This I then appended into a pro-forma registry file to give me the key name (wins.reg):


[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\ Services\NetBT\Parameters\Interfaces\Tcpip_

Which was then appended to the IP value I wanted to change for the WINS address (wins.txt):


"NameServerList"=hex(7):31, 30, 2e, 31, 39, 32, 2e, 33, 31, 2e, 32, 38, 00, 00, 00

And this I imported into the registry silently using regedit.

This all runs from batch file via a ZEN app:

@echo off

c:\zenfiles\reg query "HKLM\SOFTWARE\Microsoft\Windows NT\ CurrentVersion\NetworkCards\1\serviceName" > c:\zenfiles\nic.txt

c:\zenfiles\mtr -o$x c:\zenfiles\nic.txt - "[{][^>]*[}]" =\1\r\n > c:\zenfiles\GUID.txt

type c:\zenfiles\GUID.txt >> c:\zenfiles\wins.reg

type c:\zenfiles\wins.txt >> c:\zenfiles\wins.reg

regedit /s c:\zenfiles\wins.reg

Quick reboot and all done. No worries. Next idea is to set the app to run on machines with Static IP addresses only (System requirement). Can be done, but it's a bit trickier.

So another problem solved via ZEN and a little know how. The potential of ZEN never ceases to amaze me. Possibly the most useful tool an organisation could have.

Feel free to e-mail me at

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