Desktop App Installer

Enable Windows Package Manager Microsoft Store Source Certificate Validation Bypass

ComputerNeeds changes for IntuneEnableBypassCertificatePinningForMicrosoftStore

Supported on SUPPORTED_Windows_10_0_RS5 (defined in the Windows templates)

1.12.350

What it does

This policy controls whether the Windows Package Manager will validate the Microsoft Store certificate hash matches to a known Microsoft Store certificate when initiating a connection to the Microsoft Store Source. If you enable this policy, the Windows Package Manager will bypass the Microsoft Store certificate validation. If you disable this policy, the Windows Package Manager will validate the Microsoft Store certificate used is valid and belongs to the Microsoft Store before communicating with the Microsoft Store source. If you do not configure this policy, the Windows Package Manager administrator settings will be adhered to.

What it writes

Hive: HKEY_LOCAL_MACHINE
Registry key: Software\Policies\Microsoft\Windows\AppInstaller
Value name: EnableBypassCertificatePinningForMicrosoftStore
When enabled: DWORD 1
When disabled: DWORD 0

Why it needs changes for Intune

Policy references a Windows supportedOn definition.
ADMX-INTUNE-WINDOWS-SUPPORTEDON-REFERENCE

Configure and deploy

Choose a state; the output below is generated from the template for exactly that.

Enabled · Computer · template defaults

Registry file (.reg)

Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Windows\AppInstaller]
"EnableBypassCertificatePinningForMicrosoftStore"=dword:00000001

PowerShell

$ErrorActionPreference = 'Stop'

function Set-RegistryValue {
    param(
        [Parameter(Mandatory = $true)][string] $Path,
        [Parameter(Mandatory = $true)][string] $Name,
        [Parameter(Mandatory = $true)][string] $PropertyType,
        [Parameter(Mandatory = $true)][object] $Value
    )

    if (-not (Test-Path -LiteralPath $Path)) {
        New-Item -Path $Path -Force | Out-Null
    }

    New-ItemProperty -LiteralPath $Path -Name $Name -PropertyType $PropertyType -Value $Value -Force | Out-Null
}

function Remove-RegistryValue {
    param(
        [Parameter(Mandatory = $true)][string] $Path,
        [Parameter(Mandatory = $true)][string] $Name
    )

    if (Test-Path -LiteralPath $Path) {
        Remove-ItemProperty -LiteralPath $Path -Name $Name -Force -ErrorAction SilentlyContinue
    }
}

function Clear-RegistryKeyValues {
    param(
        [Parameter(Mandatory = $true)][string] $Path
    )

    if (-not (Test-Path -LiteralPath $Path)) {
        return
    }

    foreach ($propertyName in (Get-Item -LiteralPath $Path).Property) {
        Remove-ItemProperty -LiteralPath $Path -Name $propertyName -Force -ErrorAction SilentlyContinue
    }
}

# Policy: Enable Windows Package Manager Microsoft Store Source Certificate Validation Bypass
# Name: EnableBypassCertificatePinningForMicrosoftStore
# Scope: Machine
# State: Enabled
# Source: DesktopAppInstaller.admx

Set-RegistryValue -Path 'Registry::HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Windows\AppInstaller' -Name 'EnableBypassCertificatePinningForMicrosoftStore' -PropertyType 'DWord' -Value 1

The OMA-URI is an inferred ADMX-backed Policy CSP candidate derived from the source ADMX file name and policy name.
Some Microsoft policies use built-in Policy CSP pages whose area names don't match the ADMX file name, so verify the candidate against Microsoft Learn before deployment.

ADMX profile candidate (OMA-URI)

./Device/Vendor/MSFT/Policy/Config/ADMX_DesktopAppInstaller/EnableBypassCertificatePinningForMicrosoftStore

ADMX SyncML candidate

<SyncML xmlns="SYNCML:SYNCML1.2">
  <SyncBody>
    <Replace>
      <CmdID>1</CmdID>
      <Item>
        <Meta>
          <Format>chr</Format>
          <Type>text/plain</Type>
        </Meta>
        <Target>
          <LocURI>./Device/Vendor/MSFT/Policy/Config/ADMX_DesktopAppInstaller/EnableBypassCertificatePinningForMicrosoftStore</LocURI>
        </Target>
        <Data>&lt;enabled/&gt;</Data>
      </Item>
    </Replace>
    <Final/>
  </SyncBody>
</SyncML>

Intune remediation scripts

Detection

$ErrorActionPreference = 'Stop'
$reasons = [System.Collections.Generic.List[string]]::new()

function Test-RegistryValueExists {
    param(
        [Parameter(Mandatory = $true)][string] $Path,
        [Parameter(Mandatory = $true)][string] $Name
    )

    if (-not (Test-Path -LiteralPath $Path)) {
        return $false
    }

    return $null -ne (Get-ItemProperty -LiteralPath $Path -Name $Name -ErrorAction SilentlyContinue)
}

function Test-RegistryValueEquals {
    param(
        [Parameter(Mandatory = $true)][string] $Path,
        [Parameter(Mandatory = $true)][string] $Name,
        [Parameter(Mandatory = $true)][string] $Kind,
        [Parameter(Mandatory = $true)][object] $Expected
    )

    if (-not (Test-Path -LiteralPath $Path)) {
        return $false
    }

    $valueObject = Get-ItemProperty -LiteralPath $Path -Name $Name -ErrorAction SilentlyContinue
    if ($null -eq $valueObject) {
        return $false
    }

    $actual = $valueObject.$Name
    switch ($Kind) {
        'String' { return [string]$actual -ceq [string]$Expected }
        'ExpandString' { return [string]$actual -ceq [string]$Expected }
        'DWord' { return [uint32]$actual -eq [uint32]$Expected }
        'QWord' { return [uint64]$actual -eq [uint64]$Expected }
        'MultiString' {
            $actualArray = @($actual)
            $expectedArray = @($Expected)
            if ($actualArray.Count -ne $expectedArray.Count) { return $false }
            for ($index = 0; $index -lt $actualArray.Count; $index++) {
                if ([string]$actualArray[$index] -cne [string]$expectedArray[$index]) { return $false }
            }
            return $true
        }
        'Binary' {
            $actualArray = [byte[]]$actual
            $expectedArray = [byte[]]$Expected
            if ($actualArray.Length -ne $expectedArray.Length) { return $false }
            for ($index = 0; $index -lt $actualArray.Length; $index++) {
                if ($actualArray[$index] -ne $expectedArray[$index]) { return $false }
            }
            return $true
        }
        default { return [string]$actual -ceq [string]$Expected }
    }
}

# Policy: Enable Windows Package Manager Microsoft Store Source Certificate Validation Bypass
# Name: EnableBypassCertificatePinningForMicrosoftStore
# Scope: Machine
# State: Enabled
# Source: DesktopAppInstaller.admx

$isMatch = Test-RegistryValueEquals -Path 'Registry::HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Windows\AppInstaller' -Name 'EnableBypassCertificatePinningForMicrosoftStore' -Kind 'DWord' -Expected 1
if (-not $isMatch) {
    $reasons.Add('Value mismatch: HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Windows\AppInstaller\EnableBypassCertificatePinningForMicrosoftStore') | Out-Null
}

if ($reasons.Count -eq 0) {
    Write-Output 'Compliant'
    exit 0
}

$reasons | ForEach-Object { Write-Output $_ }
exit 1

Remediation

$ErrorActionPreference = 'Stop'

function Set-RegistryValue {
    param(
        [Parameter(Mandatory = $true)][string] $Path,
        [Parameter(Mandatory = $true)][string] $Name,
        [Parameter(Mandatory = $true)][string] $PropertyType,
        [Parameter(Mandatory = $true)][object] $Value
    )

    if (-not (Test-Path -LiteralPath $Path)) {
        New-Item -Path $Path -Force | Out-Null
    }

    New-ItemProperty -LiteralPath $Path -Name $Name -PropertyType $PropertyType -Value $Value -Force | Out-Null
}

function Remove-RegistryValue {
    param(
        [Parameter(Mandatory = $true)][string] $Path,
        [Parameter(Mandatory = $true)][string] $Name
    )

    if (Test-Path -LiteralPath $Path) {
        Remove-ItemProperty -LiteralPath $Path -Name $Name -Force -ErrorAction SilentlyContinue
    }
}

function Clear-RegistryKeyValues {
    param(
        [Parameter(Mandatory = $true)][string] $Path
    )

    if (-not (Test-Path -LiteralPath $Path)) {
        return
    }

    foreach ($propertyName in (Get-Item -LiteralPath $Path).Property) {
        Remove-ItemProperty -LiteralPath $Path -Name $propertyName -Force -ErrorAction SilentlyContinue
    }
}

# Policy: Enable Windows Package Manager Microsoft Store Source Certificate Validation Bypass
# Name: EnableBypassCertificatePinningForMicrosoftStore
# Scope: Machine
# State: Enabled
# Source: DesktopAppInstaller.admx

Set-RegistryValue -Path 'Registry::HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Windows\AppInstaller' -Name 'EnableBypassCertificatePinningForMicrosoftStore' -PropertyType 'DWord' -Value 1

History 16 retained releases

1.10.32024 Feb 2025
- Translations changed; choose a language above to compare its wording.
1.9.2518028 Oct 2024
- Renamed Enable ~~[removed: App Installer]~~[added: Windows Package Manager] Microsoft Store Source Certificate Validation Bypass
1.6.348218 Dec 2023
- Already present in the first release ChangeIntel keeps.

13 later releases left it unchanged.

Template

Internal name: EnableBypassCertificatePinningForMicrosoftStore
Namespace: Microsoft.Policies.AppInstaller
Template file: DesktopAppInstaller.admx
Release: WinGet 1.12.350 · file set e7dfa16e318cebf7…

Definition, editor controls and support

Definition

<policy class="Machine" displayName="$(string.EnableBypassCertificatePinningForMicrosoftStore)" explainText="$(string.EnableBypassCertificatePinningForMicrosoftStoreExplanation)" key="Software\Policies\Microsoft\Windows\AppInstaller" name="EnableBypassCertificatePinningForMicrosoftStore" valueName="EnableBypassCertificatePinningForMicrosoftStore" xmlns="http://schemas.microsoft.com/GroupPolicy/2006/07/PolicyDefinitions">
      <parentCategory ref="Microsoft.Policies.AppInstaller:AppInstaller" />
      <supportedOn ref="Microsoft.Policies.Windows:SUPPORTED_Windows_10_0_RS5" />
      <enabledValue>
        <decimal value="1" />
      </enabledValue>
      <disabledValue>
        <decimal value="0" />
      </disabledValue>
    </policy>

Editor controls

Supported platforms and category

Microsoft.Policies.AppInstaller:category:AppInstaller
<category displayName="$(string.AppInstaller)" name="AppInstaller" xmlns="http://schemas.microsoft.com/GroupPolicy/2006/07/PolicyDefinitions">
      <parentCategory ref="Microsoft.Policies.Windows:WindowsComponents" />
    </category>
Microsoft.Policies.AppInstaller:unresolved:Microsoft.Policies.Windows:SUPPORTED_Windows_10_0_RS5
<unresolved reference="Microsoft.Policies.Windows:SUPPORTED_Windows_10_0_RS5" />
Microsoft.Policies.AppInstaller:unresolved:Microsoft.Policies.Windows:WindowsComponents
<unresolved reference="Microsoft.Policies.Windows:WindowsComponents" />
Microsoft.Policies.AppInstaller:category:AppInstaller
<category displayName="$(string.AppInstaller)" name="AppInstaller" xmlns="http://schemas.microsoft.com/GroupPolicy/2006/07/PolicyDefinitions">
      <parentCategory ref="Microsoft.Policies.Windows:WindowsComponents" />
    </category>
<strings><string id="Microsoft.Policies.AppInstaller:AppInstaller">Desktop App Installer</string></strings>