Block launching Universal Windows apps with Windows Runtime API access from hosted content.
Verified with Windows 11 25H2 — updated on July 30, 2026
Supported on: At least Windows Server 2016, Windows 10
Path in the GPO console
Computer Configuration\Administrative Templates\Windows Components\App runtime Description
This policy setting controls whether Universal Windows apps with Windows Runtime API access directly from web content can be launched. If you enable this policy setting, Universal Windows apps which declare Windows Runtime API access in ApplicationContentUriRules section of the manifest cannot be launched; Universal Windows apps which have not declared Windows Runtime API access in the manifest are not affected. If you disable or do not configure this policy setting, all Universal Windows apps can be launched. This policy should not be enabled unless recommended by Microsoft as a security response because it can cause severe app compatibility issues.
Registry
HKLM
Software\Microsoft\Windows\CurrentVersion\Policies\System Value name: BlockHostedAppAccessWinRT
Enabled: BlockHostedAppAccessWinRT = 1
Disabled: BlockHostedAppAccessWinRT = 0
MDM / Intune (CSP)
./Device/Vendor/MSFT/Policy/Config/ADMX_AppXRuntime/AppxRuntimeBlockHostedAppAccessWinRT 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: Block launching Universal Windows apps with Windows Runtime API access from hosted content.
; State: Enabled
; Supported on: At least Windows Server 2016, Windows 10
[HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Policies\System]
"BlockHostedAppAccessWinRT"=dword:00000001More formats (PowerShell, Intune, SCCM)
PowerShell
# Exported from gporais.com
# Policy: Block launching Universal Windows apps with Windows Runtime API access from hosted content.
# State: Enabled
# Supported on: At least Windows Server 2016, Windows 10
$path = 'HKLM:\Software\Microsoft\Windows\CurrentVersion\Policies\System'
New-Item -Path $path -Force | Out-Null
Set-ItemProperty -Path $path -Name 'BlockHostedAppAccessWinRT' -Value 1 -Type DWordIntune XML
OMA-URI: ./Device/Vendor/MSFT/Policy/Config/ADMX_AppXRuntime/AppxRuntimeBlockHostedAppAccessWinRT
Data type: String
Value:
<enabled/>Intune Remediation
# === Detection script ===
# Exported from gporais.com
# Policy: Block launching Universal Windows apps with Windows Runtime API access from hosted content.
# State: Enabled
# Supported on: At least Windows Server 2016, Windows 10
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
}
$checks = @(
(Test-RegistryValue -Path 'HKLM:\Software\Microsoft\Windows\CurrentVersion\Policies\System' -Name 'BlockHostedAppAccessWinRT' -Expected 1 -Kind DWord)
)
if ($checks -notcontains $false) {
Write-Output 'Compliant'
exit 0
}
Write-Output 'Non-compliant'
exit 1
# === Remediation script ===
# Exported from gporais.com
# Policy: Block launching Universal Windows apps with Windows Runtime API access from hosted content.
# State: Enabled
# Supported on: At least Windows Server 2016, Windows 10
$path = 'HKLM:\Software\Microsoft\Windows\CurrentVersion\Policies\System'
New-Item -Path $path -Force | Out-Null
Set-ItemProperty -Path $path -Name 'BlockHostedAppAccessWinRT' -Value 1 -Type DWordSCCM scripts
# Exported from gporais.com
# Policy: Block launching Universal Windows apps with Windows Runtime API access from hosted content.
# State: Enabled
# Supported on: At least Windows Server 2016, Windows 10
# 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: Block launching Universal Windows apps with Windows Runtime API access from hosted content.
# State: Enabled
# Supported on: At least Windows Server 2016, Windows 10
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
}
$checks = @(
(Test-RegistryValue -Path 'HKLM:\Software\Microsoft\Windows\CurrentVersion\Policies\System' -Name 'BlockHostedAppAccessWinRT' -Expected 1 -Kind DWord)
)
if ($checks -notcontains $false) {
Write-Output 'Compliant'
exit 0
}
Write-Output 'Non-compliant'
exit 1
# === Remediation script ===
# Exported from gporais.com
# Policy: Block launching Universal Windows apps with Windows Runtime API access from hosted content.
# State: Enabled
# Supported on: At least Windows Server 2016, Windows 10
$path = 'HKLM:\Software\Microsoft\Windows\CurrentVersion\Policies\System'
New-Item -Path $path -Force | Out-Null
Set-ItemProperty -Path $path -Name 'BlockHostedAppAccessWinRT' -Value 1 -Type DWordBuilding a multi-setting collection? Add this setting and generate combined .reg / PowerShell / GPO scripts.