Open local files in Internet Explorer mode file extension allow list
Verified with Microsoft Edge 152.0.4191.53 — updated on July 10, 2026
Supported on: Microsoft Edge version 88, Windows 7 or later
Path in the GPO console
Computer Configuration\Administrative Templates\Microsoft Edge User Configuration\Administrative Templates\Microsoft Edge Description
This policy limits which file:// URLs are allowed to launch into Internet Explorer mode based on file extension. This setting works when 'InternetExplorerIntegrationLevel' (Configure Internet Explorer integration) is set to 'IEMode'. When a file:// URL is requested to launch in Internet Explorer mode, the file extension of the URL must be present in this list for the URL to be allowed to launch in Internet Explorer mode. A URL that's blocked from opening in Internet Explorer mode is instead opened in Microsoft Edge mode. If you set this policy to the special value "*" or don't configure it, all file extensions are allowed. To learn more about Internet Explorer mode, see https://go.microsoft.com/fwlink/?linkid=2094210 Example value: .mht .pdf .vsdx
Registry
HKLM
Software\Policies\Microsoft\Edge HKCU
Software\Policies\Microsoft\Edge 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. ⓘ
Applying both scopes creates an ambiguous configuration (computer takes precedence over user). Only do this intentionally.
.reg file
Windows Registry Editor Version 5.00
; Exported from gporais.com
; Policy: Open local files in Internet Explorer mode file extension allow list
; State: Enabled
; Scope: Computer (HKLM)
; Supported on: Microsoft Edge version 88, Windows 7 or later
[HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Edge\InternetExplorerIntegrationLocalFileExtensionAllowList]
; List values: enter one value per line in the builder UI.More formats (PowerShell, Intune, SCCM)
PowerShell
# Exported from gporais.com
# Policy: Open local files in Internet Explorer mode file extension allow list
# State: Enabled
# Scope: Computer (HKLM)
# Supported on: Microsoft Edge version 88, Windows 7 or later
$path = 'HKLM:\Software\Policies\Microsoft\Edge\InternetExplorerIntegrationLocalFileExtensionAllowList'
New-Item -Path $path -Force | Out-Null
# List values: enter one value per line in the builder UI.Intune XML
No direct Policy CSP / OMA-URI mapping for this policy. Use the Intune Remediation tab, or ingest the ADMX in Intune.Intune Remediation
# === Detection script ===
# Exported from gporais.com
# Policy: Open local files in Internet Explorer mode file extension allow list
# State: Enabled
# Scope: Computer (HKLM)
# Supported on: Microsoft Edge version 88, Windows 7 or later
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
}
# HKLM:\Software\Policies\Microsoft\Edge\InternetExplorerIntegrationLocalFileExtensionAllowList: List values: enter one value per line in the builder UI.
# No testable registry values are available for this state.
Write-Output 'Non-compliant'
exit 1
# === Remediation script ===
# Exported from gporais.com
# Policy: Open local files in Internet Explorer mode file extension allow list
# State: Enabled
# Scope: Computer (HKLM)
# Supported on: Microsoft Edge version 88, Windows 7 or later
$path = 'HKLM:\Software\Policies\Microsoft\Edge\InternetExplorerIntegrationLocalFileExtensionAllowList'
New-Item -Path $path -Force | Out-Null
# List values: enter one value per line in the builder UI.SCCM scripts
# Exported from gporais.com
# Policy: Open local files in Internet Explorer mode file extension allow list
# State: Enabled
# Scope: Computer (HKLM)
# Supported on: Microsoft Edge version 88, Windows 7 or later
# 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: Open local files in Internet Explorer mode file extension allow list
# State: Enabled
# Scope: Computer (HKLM)
# Supported on: Microsoft Edge version 88, Windows 7 or later
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
}
# HKLM:\Software\Policies\Microsoft\Edge\InternetExplorerIntegrationLocalFileExtensionAllowList: List values: enter one value per line in the builder UI.
# No testable registry values are available for this state.
Write-Output 'Non-compliant'
exit 1
# === Remediation script ===
# Exported from gporais.com
# Policy: Open local files in Internet Explorer mode file extension allow list
# State: Enabled
# Scope: Computer (HKLM)
# Supported on: Microsoft Edge version 88, Windows 7 or later
$path = 'HKLM:\Software\Policies\Microsoft\Edge\InternetExplorerIntegrationLocalFileExtensionAllowList'
New-Item -Path $path -Force | Out-Null
# List values: enter one value per line in the builder UI.Building a multi-setting collection? Add this setting and generate combined .reg / PowerShell / GPO scripts.