Show security warning for potentially unsafe files
Verified with Windows 11 25H2 — updated on July 23, 2026
Supported on: At least Internet Explorer 7.0
Path in the GPO console
Computer Configuration\Administrative Templates\Windows Components\Internet Explorer\Internet Control Panel\Security Page\Locked-Down Trusted Sites Zone User Configuration\Administrative Templates\Windows Components\Internet Explorer\Internet Control Panel\Security Page\Locked-Down Trusted Sites Zone Description
This policy setting controls whether or not the "Open File - Security Warning" message appears when the user tries to open executable files or other potentially unsafe files (from an intranet file share by using File Explorer, for example). If you enable this policy setting and set the drop-down box to Enable, these files open without a security warning. If you set the drop-down box to Prompt, a security warning appears before the files open. If you disable this policy setting, these files do not open. If you do not configure this policy setting, the user can configure how the computer handles these files. By default, these files are blocked in the Restricted zone, enabled in the Intranet and Local Computer zones, and set to prompt in the Internet and Trusted zones.
Registry
HKLM
Software\Policies\Microsoft\Windows\CurrentVersion\Internet Settings\Lockdown_Zones\2 HKCU
Software\Policies\Microsoft\Windows\CurrentVersion\Internet Settings\Lockdown_Zones\2 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: Show security warning for potentially unsafe files
; State: Enabled
; Scope: Computer (HKLM)
; Supported on: At least Internet Explorer 7.0
[HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Windows\CurrentVersion\Internet Settings\Lockdown_Zones\2]
"1806"=dword:00000000More formats (PowerShell, Intune, SCCM)
PowerShell
# Exported from gporais.com
# Policy: Show security warning for potentially unsafe files
# State: Enabled
# Scope: Computer (HKLM)
# Supported on: At least Internet Explorer 7.0
$path = 'HKLM:\Software\Policies\Microsoft\Windows\CurrentVersion\Internet Settings\Lockdown_Zones\2'
New-Item -Path $path -Force | Out-Null
Set-ItemProperty -Path $path -Name '1806' -Value 0 -Type DWordIntune XML
No direct Policy CSP / OMA-URI mapping for this policy. Use the Intune Remediation tab, or ingest the ADMX in Intune.Intune Remediation
# === Detection script ===
# Exported from gporais.com
# Policy: Show security warning for potentially unsafe files
# State: Enabled
# Scope: Computer (HKLM)
# Supported on: At least Internet Explorer 7.0
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
}
$checks = @(
(Test-RegistryValue -Path 'HKLM:\Software\Policies\Microsoft\Windows\CurrentVersion\Internet Settings\Lockdown_Zones\2' -Name '1806' -Expected 0 -Kind DWord)
)
if ($checks -notcontains $false) {
Write-Output 'Compliant'
exit 0
}
Write-Output 'Non-compliant'
exit 1
# === Remediation script ===
# Exported from gporais.com
# Policy: Show security warning for potentially unsafe files
# State: Enabled
# Scope: Computer (HKLM)
# Supported on: At least Internet Explorer 7.0
$path = 'HKLM:\Software\Policies\Microsoft\Windows\CurrentVersion\Internet Settings\Lockdown_Zones\2'
New-Item -Path $path -Force | Out-Null
Set-ItemProperty -Path $path -Name '1806' -Value 0 -Type DWordSCCM scripts
# Exported from gporais.com
# Policy: Show security warning for potentially unsafe files
# State: Enabled
# Scope: Computer (HKLM)
# Supported on: At least Internet Explorer 7.0
# 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: Show security warning for potentially unsafe files
# State: Enabled
# Scope: Computer (HKLM)
# Supported on: At least Internet Explorer 7.0
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
}
$checks = @(
(Test-RegistryValue -Path 'HKLM:\Software\Policies\Microsoft\Windows\CurrentVersion\Internet Settings\Lockdown_Zones\2' -Name '1806' -Expected 0 -Kind DWord)
)
if ($checks -notcontains $false) {
Write-Output 'Compliant'
exit 0
}
Write-Output 'Non-compliant'
exit 1
# === Remediation script ===
# Exported from gporais.com
# Policy: Show security warning for potentially unsafe files
# State: Enabled
# Scope: Computer (HKLM)
# Supported on: At least Internet Explorer 7.0
$path = 'HKLM:\Software\Policies\Microsoft\Windows\CurrentVersion\Internet Settings\Lockdown_Zones\2'
New-Item -Path $path -Force | Out-Null
Set-ItemProperty -Path $path -Name '1806' -Value 0 -Type DWordBuilding a multi-setting collection? Add this setting and generate combined .reg / PowerShell / GPO scripts.