Allow local MHTML files to open automatically in Internet Explorer mode
Verified with Microsoft Edge 152.0.4191.53 — updated on July 10, 2026
Supported on: Microsoft Edge version 107, Windows 7 or later
Path in the GPO console
Computer Configuration\Administrative Templates\Microsoft Edge User Configuration\Administrative Templates\Microsoft Edge Description
This policy controls whether local mht or mhtml files launched from the command line open automatically in Internet Explorer mode based on the file content without specifying the --ie-mode-file-url command line. This setting works when 'InternetExplorerIntegrationLevel' (Configure Internet Explorer integration) is set to 'IEMode' and 'InternetExplorerIntegrationLocalFileAllowed' (Allow launching of local files in Internet Explorer mode) is enabled or not configured. If you enable or don't configure this policy, local mht or mhtml files launch in Microsoft Edge or Internet Explorer mode. Then, you can view these files in the best way. If you disable this policy, local mht or mhtml files launch in Microsoft Edge. If you use the --ie-mode-file-url command line argument for launching local mht or mhtml files, it takes precedence over how you configured this policy. To learn more about Internet Explorer mode, see https://go.microsoft.com/fwlink/?linkid=2094210
Registry
Software\Policies\Microsoft\Edge Software\Policies\Microsoft\Edge Value name: InternetExplorerIntegrationLocalMhtFileAllowed
Enabled: InternetExplorerIntegrationLocalMhtFileAllowed = 1
Disabled: InternetExplorerIntegrationLocalMhtFileAllowed = 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. ⓘ
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: Allow local MHTML files to open automatically in Internet Explorer mode
; State: Enabled
; Scope: Computer (HKLM)
; Supported on: Microsoft Edge version 107, Windows 7 or later
[HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Edge]
"InternetExplorerIntegrationLocalMhtFileAllowed"=dword:00000001More formats (PowerShell, Intune, SCCM)
PowerShell
# Exported from gporais.com
# Policy: Allow local MHTML files to open automatically in Internet Explorer mode
# State: Enabled
# Scope: Computer (HKLM)
# Supported on: Microsoft Edge version 107, Windows 7 or later
$path = 'HKLM:\Software\Policies\Microsoft\Edge'
New-Item -Path $path -Force | Out-Null
Set-ItemProperty -Path $path -Name 'InternetExplorerIntegrationLocalMhtFileAllowed' -Value 1 -Type DWordIntune 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: Allow local MHTML files to open automatically in Internet Explorer mode
# State: Enabled
# Scope: Computer (HKLM)
# Supported on: Microsoft Edge version 107, 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
}
$checks = @(
(Test-RegistryValue -Path 'HKLM:\Software\Policies\Microsoft\Edge' -Name 'InternetExplorerIntegrationLocalMhtFileAllowed' -Expected 1 -Kind DWord)
)
if ($checks -notcontains $false) {
Write-Output 'Compliant'
exit 0
}
Write-Output 'Non-compliant'
exit 1
# === Remediation script ===
# Exported from gporais.com
# Policy: Allow local MHTML files to open automatically in Internet Explorer mode
# State: Enabled
# Scope: Computer (HKLM)
# Supported on: Microsoft Edge version 107, Windows 7 or later
$path = 'HKLM:\Software\Policies\Microsoft\Edge'
New-Item -Path $path -Force | Out-Null
Set-ItemProperty -Path $path -Name 'InternetExplorerIntegrationLocalMhtFileAllowed' -Value 1 -Type DWordSCCM scripts
# Exported from gporais.com
# Policy: Allow local MHTML files to open automatically in Internet Explorer mode
# State: Enabled
# Scope: Computer (HKLM)
# Supported on: Microsoft Edge version 107, 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: Allow local MHTML files to open automatically in Internet Explorer mode
# State: Enabled
# Scope: Computer (HKLM)
# Supported on: Microsoft Edge version 107, 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
}
$checks = @(
(Test-RegistryValue -Path 'HKLM:\Software\Policies\Microsoft\Edge' -Name 'InternetExplorerIntegrationLocalMhtFileAllowed' -Expected 1 -Kind DWord)
)
if ($checks -notcontains $false) {
Write-Output 'Compliant'
exit 0
}
Write-Output 'Non-compliant'
exit 1
# === Remediation script ===
# Exported from gporais.com
# Policy: Allow local MHTML files to open automatically in Internet Explorer mode
# State: Enabled
# Scope: Computer (HKLM)
# Supported on: Microsoft Edge version 107, Windows 7 or later
$path = 'HKLM:\Software\Policies\Microsoft\Edge'
New-Item -Path $path -Force | Out-Null
Set-ItemProperty -Path $path -Name 'InternetExplorerIntegrationLocalMhtFileAllowed' -Value 1 -Type DWordBuilding a multi-setting collection? Add this setting and generate combined .reg / PowerShell / GPO scripts.