RegDelNull - Sysinternals
By markruss
Archived: 2026-04-05 15:03:23 UTC
By Mark Russinovich
Published: July 4, 2016
 Download RegDelNull (511 KB)
Introduction
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]
Parameter Description
-s Recurse 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 - www.sysinternals.com
Null-embedded key (Nulls are replaced by '*'):
HKLM\SOFTWARE\Systems Internals\Can't touch me!*
Delete (y/n) y
Scan complete.
 Download RegDelNull (511 KB)
Runs on:
Client: Windows Vista (32-bit) and higher
https://docs.microsoft.com/en-us/sysinternals/downloads/regdelnull
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Server: Windows Server 2008 (32-bit) and higher
Nano Server: 2016 and higher
Source: https://docs.microsoft.com/en-us/sysinternals/downloads/regdelnull
https://docs.microsoft.com/en-us/sysinternals/downloads/regdelnull
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