Embedded Files Blocked Extensions

UserNeeds changes for IntuneL_EmbeddedFilesBlockedExtensions

Supported on SUPPORTED_Windows7 (defined in the Windows templates)

5568.1000

What it does

To disable the ability of the users in your organization from being able to open a file attachment of a specific file type from a Microsoft OneNote page, add the extensions you want to disable using this format: ".ext1;.ext2;" If you want to disable the opening of any attachment from a OneNote page, see the Disable embedded files policy. You cannot block embedded audio and video recordings (WMA & WMV) with this policy instead refer to the Disable embedded files policy.

What it writes

Hive: HKEY_CURRENT_USER
Registry key: software\policies\microsoft\office\16.0\onenote\options\embeddedfileopenoptions

Why it needs changes for Intune

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

Options

Option	Type	Registry value	Allowed values
L_empty12	Text	`blockedextensions`	Up to 255 characters

Configure and deploy

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

Enabled · User · template defaults

Registry file (.reg)

Windows Registry Editor Version 5.00

[HKEY_CURRENT_USER\software\policies\microsoft\office\16.0\onenote\options\embeddedfileopenoptions]
"blockedextensions"=""

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: Embedded Files Blocked Extensions
# Name: L_EmbeddedFilesBlockedExtensions
# Scope: User
# State: Enabled
# Source: onent16.admx

Set-RegistryValue -Path 'Registry::HKEY_CURRENT_USER\software\policies\microsoft\office\16.0\onenote\options\embeddedfileopenoptions' -Name 'blockedextensions' -PropertyType 'String' -Value ''

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.
The generated payload is incomplete because one or more ADMX element values were not supplied: L_empty12

ADMX profile candidate (OMA-URI)

./User/Vendor/MSFT/Policy/Config/ADMX_onent16/L_EmbeddedFilesBlockedExtensions

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: Embedded Files Blocked Extensions
# Name: L_EmbeddedFilesBlockedExtensions
# Scope: User
# State: Enabled
# Source: onent16.admx

$isMatch = Test-RegistryValueEquals -Path 'Registry::HKEY_CURRENT_USER\software\policies\microsoft\office\16.0\onenote\options\embeddedfileopenoptions' -Name 'blockedextensions' -Kind 'String' -Expected ''
if (-not $isMatch) {
    $reasons.Add('Value mismatch: HKEY_CURRENT_USER\software\policies\microsoft\office\16.0\onenote\options\embeddedfileopenoptions\blockedextensions') | 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: Embedded Files Blocked Extensions
# Name: L_EmbeddedFilesBlockedExtensions
# Scope: User
# State: Enabled
# Source: onent16.admx

Set-RegistryValue -Path 'Registry::HKEY_CURRENT_USER\software\policies\microsoft\office\16.0\onenote\options\embeddedfileopenoptions' -Name 'blockedextensions' -PropertyType 'String' -Value ''

History 1 retained release

5568.100010 Aug 2026
- Already present in the first release ChangeIntel keeps.

Template

Internal name: L_EmbeddedFilesBlockedExtensions
Namespace: onent16.Office.Microsoft.Policies.Windows
Template file: onent16.admx
Release: Microsoft 365 Apps 5568.1000 · file set 8be05d876aae137d…

Definition, editor controls and support

Definition

<policy class="User" displayName="$(string.L_EmbeddedFilesBlockedExtensions)" explainText="$(string.L_EmbeddedFilesBlockedExtensionsExplain)" key="software\policies\microsoft\office\16.0\onenote\options\embeddedfileopenoptions" name="L_EmbeddedFilesBlockedExtensions" presentation="$(presentation.L_EmbeddedFilesBlockedExtensions)" xmlns="http://schemas.microsoft.com/GroupPolicy/2006/07/PolicyDefinitions">
      <parentCategory ref="onent16.Office.Microsoft.Policies.Windows:L_Other" />
      <supportedOn ref="Microsoft.Policies.Windows:SUPPORTED_Windows7" />
      <elements>
        <text id="L_empty12" valueName="blockedextensions" />
      </elements>
    </policy>

Editor controls

<presentation id="L_EmbeddedFilesBlockedExtensions" xmlns="http://schemas.microsoft.com/GroupPolicy/2006/07/PolicyDefinitions">
        <textBox refId="L_empty12">
          <label>
          </label>
        </textBox>
      </presentation>

Supported platforms and category

onent16.Office.Microsoft.Policies.Windows:category:L_MicrosoftOfficeOneNote
<category displayName="$(string.L_MicrosoftOfficeOneNote)" name="L_MicrosoftOfficeOneNote" xmlns="http://schemas.microsoft.com/GroupPolicy/2006/07/PolicyDefinitions" />
onent16.Office.Microsoft.Policies.Windows:category:L_OneNoteOptions
<category displayName="$(string.L_OneNoteOptions)" name="L_OneNoteOptions" xmlns="http://schemas.microsoft.com/GroupPolicy/2006/07/PolicyDefinitions">
      <parentCategory ref="onent16.Office.Microsoft.Policies.Windows:L_MicrosoftOfficeOneNote" />
    </category>
onent16.Office.Microsoft.Policies.Windows:category:L_Other
<category displayName="$(string.L_Other)" name="L_Other" xmlns="http://schemas.microsoft.com/GroupPolicy/2006/07/PolicyDefinitions">
      <parentCategory ref="onent16.Office.Microsoft.Policies.Windows:L_OneNoteOptions" />
    </category>
onent16.Office.Microsoft.Policies.Windows:unresolved:Microsoft.Policies.Windows:SUPPORTED_Windows7
<unresolved reference="Microsoft.Policies.Windows:SUPPORTED_Windows7" />
onent16.Office.Microsoft.Policies.Windows:category:L_MicrosoftOfficeOneNote
<category displayName="$(string.L_MicrosoftOfficeOneNote)" name="L_MicrosoftOfficeOneNote" xmlns="http://schemas.microsoft.com/GroupPolicy/2006/07/PolicyDefinitions" />
<strings><string id="onent16.Office.Microsoft.Policies.Windows:L_MicrosoftOfficeOneNote">Microsoft OneNote 2016</string></strings>
onent16.Office.Microsoft.Policies.Windows:category:L_OneNoteOptions
<category displayName="$(string.L_OneNoteOptions)" name="L_OneNoteOptions" xmlns="http://schemas.microsoft.com/GroupPolicy/2006/07/PolicyDefinitions">
      <parentCategory ref="onent16.Office.Microsoft.Policies.Windows:L_MicrosoftOfficeOneNote" />
    </category>
<strings><string id="onent16.Office.Microsoft.Policies.Windows:L_OneNoteOptions">OneNote Options</string></strings>
onent16.Office.Microsoft.Policies.Windows:category:L_Other
<category displayName="$(string.L_Other)" name="L_Other" xmlns="http://schemas.microsoft.com/GroupPolicy/2006/07/PolicyDefinitions">
      <parentCategory ref="onent16.Office.Microsoft.Policies.Windows:L_OneNoteOptions" />
    </category>
<strings><string id="onent16.Office.Microsoft.Policies.Windows:L_Other">Other</string></strings>