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RegDelNull v1.11

By Mark Russinovich

Published: July 4, 2016

 Download RegDelNull (152 KB)



This command-line utility searches for and allows you to delete Registry keys that contain embedded-null characters and that are otherwise undeleteable using standard Registry-editing tools. Note: deleting Registry keys may cause the applications they are associated with to fail.


Using RegDelNull

Usage: regdelnull <path> [-s]

-sRecurse into subkeys.

Here's an example of RegDelNull when used on a system on which the RegHide sample program has created a null-embedded key:

C:\>regdelnull hklm -sRegDelNull v1.10 - Delete Registry keys with embedded Nulls

Copyright (C) 2005-2006 Mark Russinovich

Sysinternals -

Null-embedded key (Nulls are replaced by '*'):

HKLM\SOFTWARE\Systems Internals\Can't touch me!*

Delete (y/n) y

Scan complete.


Download Regdelnull
(152 KB)



Download Regdelnull
(152 KB)


Runs on:

  • Client: Windows Vista (32-bit) and higher
  • Server: Windows Server 2008 (32-bit) and higher
  • Nano Server: 2016 and higher