Block launching Universal Windows apps with Windows Runtime API access from hosted content.: registry value BlockHostedAppAccessWinRTComputerHKLM\Software\Microsoft\Windows\CurrentVersion\Policies\System

Policy ID: AppxRuntimeBlockHostedAppAccessWinRT
Scope: Computer Configuration
Supported on: At least Windows Server 2016, Windows 10
Source: Administrative Templates (.admx) for Windows 11 2026 Update (26H2) (version 1.0)
Category: Windows Components › App runtime

Registry

BlockHostedAppAccessWinRT

REG_DWORDComputer

HKLM\Software\Microsoft\Windows\CurrentVersion\Policies\System Current key

Enabled value: 1
Disabled value: 0

Apply with .reg · CMD · PowerShell

.reg

Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Policies\System]

; Options (use only one)
; Enabled
"BlockHostedAppAccessWinRT"=dword:00000001
; Disabled
"BlockHostedAppAccessWinRT"=dword:00000000

CMD

:: Options (use only one)

:: Enabled
reg add "HKLM\Software\Microsoft\Windows\CurrentVersion\Policies\System" /v "BlockHostedAppAccessWinRT" /t REG_DWORD /d 1 /f
:: Disabled
reg add "HKLM\Software\Microsoft\Windows\CurrentVersion\Policies\System" /v "BlockHostedAppAccessWinRT" /t REG_DWORD /d 0 /f

PowerShell

# Common: create the key
New-Item -Path 'HKLM:\Software\Microsoft\Windows\CurrentVersion\Policies\System' -Force | Out-Null

# Options (use only one)
# Enabled
New-ItemProperty -Path 'HKLM:\Software\Microsoft\Windows\CurrentVersion\Policies\System' -Name 'BlockHostedAppAccessWinRT' -PropertyType DWord -Value 1 -Force | Out-Null
# Disabled
New-ItemProperty -Path 'HKLM:\Software\Microsoft\Windows\CurrentVersion\Policies\System' -Name 'BlockHostedAppAccessWinRT' -PropertyType DWord -Value 0 -Force | Out-Null