Custom Instant Search Internet search provider: registry value InternetExtensionName and 1 moreUserHKCU\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer\SearchExtensions

Policy ID: CustomSearch
Scope: User Configuration
Supported on: At least Windows Vista
Source: Administrative Templates (.admx) for Windows 11 2026 Update (26H2) (version 1.0)
Category: Windows Components › Instant Search

Registry

InternetExtensionName

REG_SZUser

HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer\SearchExtensions Current key

Enabled value: Depends on the option value
Element: The string or DLL resource from which to load the string shown in the Instant Search menu.
Value type: REG_SZ
Required: true

Apply with .reg · CMD · PowerShell

.reg

Windows Registry Editor Version 5.00

[HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer\SearchExtensions]

; Value names and types follow the ADMX. Replace <enter value> below with your own data
"InternetExtensionName"="<enter value>"

CMD

:: Value names and types follow the ADMX. Replace <enter value> below with your own data

reg add "HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer\SearchExtensions" /v "InternetExtensionName" /t REG_SZ /d "<enter value>" /f

PowerShell

# Value names and types follow the ADMX. Replace <enter value> below with your own data

New-Item -Path 'HKCU:\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer\SearchExtensions' -Force | Out-Null
New-ItemProperty -Path 'HKCU:\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer\SearchExtensions' -Name 'InternetExtensionName' -PropertyType String -Value '<enter value>' -Force | Out-Null

InternetExtensionAction

REG_SZUser

HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer\SearchExtensions Current key

Enabled value: Depends on the option value
Element: The URL to use when invoking the custom Internet search, with the search term indicated by "%w".
Value type: REG_SZ
Required: true

Apply with .reg · CMD · PowerShell

.reg

Windows Registry Editor Version 5.00

[HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer\SearchExtensions]

; Value names and types follow the ADMX. Replace <enter value> below with your own data
"InternetExtensionAction"="<enter value>"

CMD

:: Value names and types follow the ADMX. Replace <enter value> below with your own data

reg add "HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer\SearchExtensions" /v "InternetExtensionAction" /t REG_SZ /d "<enter value>" /f

PowerShell

# Value names and types follow the ADMX. Replace <enter value> below with your own data

New-Item -Path 'HKCU:\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer\SearchExtensions' -Force | Out-Null
New-ItemProperty -Path 'HKCU:\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer\SearchExtensions' -Name 'InternetExtensionAction' -PropertyType String -Value '<enter value>' -Force | Out-Null