Prevent bypassing SmartScreen Filter warnings about files that are not commonly downloaded from the Internet
Verified with Windows 11 25H2 — updated on July 30, 2026
Supported on: At least Internet Explorer 9.0
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 determines whether the user can bypass warnings from SmartScreen Filter. SmartScreen Filter warns the user about executable files that Internet Explorer users do not commonly download from the Internet. If you enable this policy setting, SmartScreen Filter warnings block the user. If you disable or do not configure this policy setting, the user can bypass SmartScreen Filter warnings.
Registry
HKLM
Software\Policies\Microsoft\Internet Explorer\PhishingFilter HKCU
Software\Policies\Microsoft\Internet Explorer\PhishingFilter Value name: PreventOverrideAppRepUnknown
MDM / Intune (CSP)
Device
./Device/Vendor/MSFT/Policy/Config/InternetExplorer/DisableBypassOfSmartScreenWarningsAboutUncommonFiles User
./User/Vendor/MSFT/Policy/Config/InternetExplorer/DisableBypassOfSmartScreenWarningsAboutUncommonFiles 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: Prevent bypassing SmartScreen Filter warnings about files that are not commonly downloaded from the Internet
; State: Enabled
; Scope: Computer (HKLM)
; Supported on: At least Internet Explorer 9.0
[HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Internet Explorer\PhishingFilter]
"PreventOverrideAppRepUnknown"=dword:00000001More formats (PowerShell, Intune, SCCM)
PowerShell
# Exported from gporais.com
# Policy: Prevent bypassing SmartScreen Filter warnings about files that are not commonly downloaded from the Internet
# State: Enabled
# Scope: Computer (HKLM)
# Supported on: At least Internet Explorer 9.0
$path = 'HKLM:\Software\Policies\Microsoft\Internet Explorer\PhishingFilter'
New-Item -Path $path -Force | Out-Null
Set-ItemProperty -Path $path -Name 'PreventOverrideAppRepUnknown' -Value 1 -Type DWordIntune XML
OMA-URI: ./Device/Vendor/MSFT/Policy/Config/InternetExplorer/DisableBypassOfSmartScreenWarningsAboutUncommonFiles
Data type: String
Value:
<enabled/>Intune Remediation
# === Detection script ===
# Exported from gporais.com
# Policy: Prevent bypassing SmartScreen Filter warnings about files that are not commonly downloaded from the Internet
# State: Enabled
# Scope: Computer (HKLM)
# Supported on: At least Internet Explorer 9.0
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
}
$checks = @(
(Test-RegistryValue -Path 'HKLM:\Software\Policies\Microsoft\Internet Explorer\PhishingFilter' -Name 'PreventOverrideAppRepUnknown' -Expected 1 -Kind DWord)
)
if ($checks -notcontains $false) {
Write-Output 'Compliant'
exit 0
}
Write-Output 'Non-compliant'
exit 1
# === Remediation script ===
# Exported from gporais.com
# Policy: Prevent bypassing SmartScreen Filter warnings about files that are not commonly downloaded from the Internet
# State: Enabled
# Scope: Computer (HKLM)
# Supported on: At least Internet Explorer 9.0
$path = 'HKLM:\Software\Policies\Microsoft\Internet Explorer\PhishingFilter'
New-Item -Path $path -Force | Out-Null
Set-ItemProperty -Path $path -Name 'PreventOverrideAppRepUnknown' -Value 1 -Type DWordSCCM scripts
# Exported from gporais.com
# Policy: Prevent bypassing SmartScreen Filter warnings about files that are not commonly downloaded from the Internet
# State: Enabled
# Scope: Computer (HKLM)
# Supported on: At least Internet Explorer 9.0
# 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: Prevent bypassing SmartScreen Filter warnings about files that are not commonly downloaded from the Internet
# State: Enabled
# Scope: Computer (HKLM)
# Supported on: At least Internet Explorer 9.0
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
}
$checks = @(
(Test-RegistryValue -Path 'HKLM:\Software\Policies\Microsoft\Internet Explorer\PhishingFilter' -Name 'PreventOverrideAppRepUnknown' -Expected 1 -Kind DWord)
)
if ($checks -notcontains $false) {
Write-Output 'Compliant'
exit 0
}
Write-Output 'Non-compliant'
exit 1
# === Remediation script ===
# Exported from gporais.com
# Policy: Prevent bypassing SmartScreen Filter warnings about files that are not commonly downloaded from the Internet
# State: Enabled
# Scope: Computer (HKLM)
# Supported on: At least Internet Explorer 9.0
$path = 'HKLM:\Software\Policies\Microsoft\Internet Explorer\PhishingFilter'
New-Item -Path $path -Force | Out-Null
Set-ItemProperty -Path $path -Name 'PreventOverrideAppRepUnknown' -Value 1 -Type DWordBuilding a multi-setting collection? Add this setting and generate combined .reg / PowerShell / GPO scripts.