Inclusion list for high risk file types
Verified with Windows 11 25H2 — updated on July 30, 2026
Supported on: At least Windows XP Professional with SP2
Path in the GPO console
User Configuration\Administrative Templates\Windows Components\Attachment Manager Description
This policy setting allows you to configure the list of high-risk file types. If the file attachment is in the list of high-risk file types and is from the restricted zone, Windows blocks the user from accessing the file. If the file is from the Internet zone, Windows prompts the user before accessing the file. This inclusion list takes precedence over the medium-risk and low-risk inclusion lists (where an extension is listed in more than one inclusion list). If you enable this policy setting, you can create a custom list of high-risk file types. If you disable this policy setting, Windows uses its built-in list of file types that pose a high risk. If you do not configure this policy setting, Windows uses its built-in list of high-risk file types.
Registry
HKCU
Software\Microsoft\Windows\CurrentVersion\Policies\Associations MDM / Intune (CSP)
./User/Vendor/MSFT/Policy/Config/ADMX_AttachmentManager/AM_SetHighRiskInclusion 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. ⓘ
.reg file
Windows Registry Editor Version 5.00
; Exported from gporais.com
; Policy: Inclusion list for high risk file types
; State: Enabled
; Supported on: At least Windows XP Professional with SP2
[HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Associations]
"HighRiskFileTypes"=""More formats (PowerShell, Intune, SCCM)
PowerShell
# Exported from gporais.com
# Policy: Inclusion list for high risk file types
# State: Enabled
# Supported on: At least Windows XP Professional with SP2
# Warning: In SYSTEM context (the Intune default), HKCU targets the SYSTEM profile. Run this script using the logged-on credentials.
$path = 'HKCU:\Software\Microsoft\Windows\CurrentVersion\Policies\Associations'
New-Item -Path $path -Force | Out-Null
Set-ItemProperty -Path $path -Name 'HighRiskFileTypes' -Value '' -Type StringIntune XML
OMA-URI: ./User/Vendor/MSFT/Policy/Config/ADMX_AttachmentManager/AM_SetHighRiskInclusion
Data type: String
Value:
<enabled/>
<data id="AM_InstructHighRiskInclusionList" value=""/>Intune Remediation
# === Detection script ===
# Exported from gporais.com
# Policy: Inclusion list for high risk file types
# State: Enabled
# Supported on: At least Windows XP Professional with SP2
# Warning: In SYSTEM context (the Intune default), HKCU targets the SYSTEM profile. Run this script using the logged-on credentials.
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
}
$checks = @(
(Test-RegistryValue -Path 'HKCU:\Software\Microsoft\Windows\CurrentVersion\Policies\Associations' -Name 'HighRiskFileTypes' -Expected '' -Kind String)
)
if ($checks -notcontains $false) {
Write-Output 'Compliant'
exit 0
}
Write-Output 'Non-compliant'
exit 1
# === Remediation script ===
# Exported from gporais.com
# Policy: Inclusion list for high risk file types
# State: Enabled
# Supported on: At least Windows XP Professional with SP2
# Warning: In SYSTEM context (the Intune default), HKCU targets the SYSTEM profile. Run this script using the logged-on credentials.
$path = 'HKCU:\Software\Microsoft\Windows\CurrentVersion\Policies\Associations'
New-Item -Path $path -Force | Out-Null
Set-ItemProperty -Path $path -Name 'HighRiskFileTypes' -Value '' -Type StringSCCM scripts
# Exported from gporais.com
# Policy: Inclusion list for high risk file types
# State: Enabled
# Supported on: At least Windows XP Professional with SP2
# 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: Inclusion list for high risk file types
# State: Enabled
# Supported on: At least Windows XP Professional with SP2
# Warning: In SYSTEM context (the Intune default), HKCU targets the SYSTEM profile. Run this script using the logged-on credentials.
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
}
$checks = @(
(Test-RegistryValue -Path 'HKCU:\Software\Microsoft\Windows\CurrentVersion\Policies\Associations' -Name 'HighRiskFileTypes' -Expected '' -Kind String)
)
if ($checks -notcontains $false) {
Write-Output 'Compliant'
exit 0
}
Write-Output 'Non-compliant'
exit 1
# === Remediation script ===
# Exported from gporais.com
# Policy: Inclusion list for high risk file types
# State: Enabled
# Supported on: At least Windows XP Professional with SP2
# Warning: In SYSTEM context (the Intune default), HKCU targets the SYSTEM profile. Run this script using the logged-on credentials.
$path = 'HKCU:\Software\Microsoft\Windows\CurrentVersion\Policies\Associations'
New-Item -Path $path -Force | Out-Null
Set-ItemProperty -Path $path -Name 'HighRiskFileTypes' -Value '' -Type StringBuilding a multi-setting collection? Add this setting and generate combined .reg / PowerShell / GPO scripts.