Replace JScript by loading JScript9Legacy in place of JScript.
Verified with Windows 11 25H2 — updated on July 30, 2026
Supported on: At least Internet Explorer 11.0
Path in the GPO console
Computer Configuration\Administrative Templates\Windows Components\Internet Explorer User Configuration\Administrative Templates\Windows Components\Internet Explorer Description
This policy setting specifies whether JScript or JScript9Legacy is loaded. If you enable this policy setting or not configured, JScript9Legacy will be loaded in situations where JScript is instantiated. If you disable this policy, then JScript will be utilized.
Registry
HKLM
Software\Policies\Microsoft\Internet Explorer\Main HKCU
Software\Policies\Microsoft\Internet Explorer\Main Value name: JScriptReplacement
Enabled: JScriptReplacement = 1
Disabled: JScriptReplacement = 0
MDM / Intune (CSP)
Device
./Device/Vendor/MSFT/Policy/Config/InternetExplorer/JScriptReplacement User
./User/Vendor/MSFT/Policy/Config/InternetExplorer/JScriptReplacement Microsoft Learn documentation Mapping data: Microsoft Learn (CC BY 4.0)
Export Builder
BETAConfigure the state, scope and options, then generate .reg, PowerShell, Intune and SCCM outputs — or add the setting to a multi-setting collection.
These exports write the registry — this is not a managed GPO. ⓘ
Applying both scopes creates an ambiguous configuration (computer takes precedence over user). Only do this intentionally.
.reg file
Windows Registry Editor Version 5.00
; Exported from gporais.com
; Policy: Replace JScript by loading JScript9Legacy in place of JScript.
; State: Enabled
; Scope: Computer (HKLM)
; Supported on: At least Internet Explorer 11.0
[HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Internet Explorer\Main]
"JScriptReplacement"=dword:00000001More formats (PowerShell, Intune, SCCM)
PowerShell
# Exported from gporais.com
# Policy: Replace JScript by loading JScript9Legacy in place of JScript.
# State: Enabled
# Scope: Computer (HKLM)
# Supported on: At least Internet Explorer 11.0
$path = 'HKLM:\Software\Policies\Microsoft\Internet Explorer\Main'
New-Item -Path $path -Force | Out-Null
Set-ItemProperty -Path $path -Name 'JScriptReplacement' -Value 1 -Type DWordIntune XML
OMA-URI: ./Device/Vendor/MSFT/Policy/Config/InternetExplorer/JScriptReplacement
Data type: String
Value:
<enabled/>Intune Remediation
# === Detection script ===
# Exported from gporais.com
# Policy: Replace JScript by loading JScript9Legacy in place of JScript.
# State: Enabled
# Scope: Computer (HKLM)
# Supported on: At least Internet Explorer 11.0
function Test-RegistryValue {
param(
[Parameter(Mandatory = $true)][string]$Path,
[Parameter(Mandatory = $true)][string]$Name,
[object]$Expected,
[ValidateSet('String', 'DWord', 'MultiString')][string]$Kind = 'String',
[switch]$Absent
)
try {
$item = Get-ItemProperty -LiteralPath $Path -Name $Name -ErrorAction Stop
} catch {
return $Absent.IsPresent
}
if ($Absent.IsPresent) { return $false }
$actual = $item.$Name
if ($Kind -eq 'DWord') { return ([int64]$actual) -eq ([int64]$Expected) }
if ($Kind -eq 'MultiString') {
$actualValues = @($actual)
$expectedValues = @($Expected)
if ($actualValues.Count -ne $expectedValues.Count) { return $false }
for ($i = 0; $i -lt $expectedValues.Count; $i++) {
if ([string]$actualValues[$i] -ne [string]$expectedValues[$i]) { return $false }
}
return $true
}
return [string]$actual -eq [string]$Expected
}
$checks = @(
(Test-RegistryValue -Path 'HKLM:\Software\Policies\Microsoft\Internet Explorer\Main' -Name 'JScriptReplacement' -Expected 1 -Kind DWord)
)
if ($checks -notcontains $false) {
Write-Output 'Compliant'
exit 0
}
Write-Output 'Non-compliant'
exit 1
# === Remediation script ===
# Exported from gporais.com
# Policy: Replace JScript by loading JScript9Legacy in place of JScript.
# State: Enabled
# Scope: Computer (HKLM)
# Supported on: At least Internet Explorer 11.0
$path = 'HKLM:\Software\Policies\Microsoft\Internet Explorer\Main'
New-Item -Path $path -Force | Out-Null
Set-ItemProperty -Path $path -Name 'JScriptReplacement' -Value 1 -Type DWordSCCM scripts
# Exported from gporais.com
# Policy: Replace JScript by loading JScript9Legacy in place of JScript.
# State: Enabled
# Scope: Computer (HKLM)
# Supported on: At least Internet Explorer 11.0
# SCCM Configuration Item guidance:
# Create a Configuration Item of type "Setting: Script".
# Discovery script: use the Detection script below.
# Remediation script: use the Remediation script below.
# Compliance rule: the Discovery script output equals 'Compliant'.
# === Detection script ===
# Exported from gporais.com
# Policy: Replace JScript by loading JScript9Legacy in place of JScript.
# State: Enabled
# Scope: Computer (HKLM)
# Supported on: At least Internet Explorer 11.0
function Test-RegistryValue {
param(
[Parameter(Mandatory = $true)][string]$Path,
[Parameter(Mandatory = $true)][string]$Name,
[object]$Expected,
[ValidateSet('String', 'DWord', 'MultiString')][string]$Kind = 'String',
[switch]$Absent
)
try {
$item = Get-ItemProperty -LiteralPath $Path -Name $Name -ErrorAction Stop
} catch {
return $Absent.IsPresent
}
if ($Absent.IsPresent) { return $false }
$actual = $item.$Name
if ($Kind -eq 'DWord') { return ([int64]$actual) -eq ([int64]$Expected) }
if ($Kind -eq 'MultiString') {
$actualValues = @($actual)
$expectedValues = @($Expected)
if ($actualValues.Count -ne $expectedValues.Count) { return $false }
for ($i = 0; $i -lt $expectedValues.Count; $i++) {
if ([string]$actualValues[$i] -ne [string]$expectedValues[$i]) { return $false }
}
return $true
}
return [string]$actual -eq [string]$Expected
}
$checks = @(
(Test-RegistryValue -Path 'HKLM:\Software\Policies\Microsoft\Internet Explorer\Main' -Name 'JScriptReplacement' -Expected 1 -Kind DWord)
)
if ($checks -notcontains $false) {
Write-Output 'Compliant'
exit 0
}
Write-Output 'Non-compliant'
exit 1
# === Remediation script ===
# Exported from gporais.com
# Policy: Replace JScript by loading JScript9Legacy in place of JScript.
# State: Enabled
# Scope: Computer (HKLM)
# Supported on: At least Internet Explorer 11.0
$path = 'HKLM:\Software\Policies\Microsoft\Internet Explorer\Main'
New-Item -Path $path -Force | Out-Null
Set-ItemProperty -Path $path -Name 'JScriptReplacement' -Value 1 -Type DWordBuilding a multi-setting collection? Add this setting and generate combined .reg / PowerShell / GPO scripts.