Automatically open downloaded MHT or MHTML files from the web in Internet Explorer mode
Verified with Microsoft Edge 152.0.4191.53 — updated on July 10, 2026
Supported on: Microsoft Edge version 117, 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 MHT or MHTML files that are downloaded from the web are automatically opened in Internet Explorer mode. If you enable this policy, the MHT or MHTML files that are downloaded from the web can be opened in both Microsoft Edge and Internet Explorer mode to provide the best user experience. If you disable or don't configure this policy, MHT or MHTML files that are downloaded from the web won't automatically open in Internet Explorer mode. To learn more about Internet Explorer mode, see https://go.microsoft.com/fwlink/?linkid=2094210
Registry
HKLM
Software\Policies\Microsoft\Edge HKCU
Software\Policies\Microsoft\Edge Value name: InternetExplorerIntegrationZoneIdentifierMhtFileAllowed
Enabled: InternetExplorerIntegrationZoneIdentifierMhtFileAllowed = 1
Disabled: InternetExplorerIntegrationZoneIdentifierMhtFileAllowed = 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: Automatically open downloaded MHT or MHTML files from the web in Internet Explorer mode
; State: Enabled
; Scope: Computer (HKLM)
; Supported on: Microsoft Edge version 117, Windows 7 or later
[HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Edge]
"InternetExplorerIntegrationZoneIdentifierMhtFileAllowed"=dword:00000001More formats (PowerShell, Intune, SCCM)
PowerShell
# Exported from gporais.com
# Policy: Automatically open downloaded MHT or MHTML files from the web in Internet Explorer mode
# State: Enabled
# Scope: Computer (HKLM)
# Supported on: Microsoft Edge version 117, Windows 7 or later
$path = 'HKLM:\Software\Policies\Microsoft\Edge'
New-Item -Path $path -Force | Out-Null
Set-ItemProperty -Path $path -Name 'InternetExplorerIntegrationZoneIdentifierMhtFileAllowed' -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: Automatically open downloaded MHT or MHTML files from the web in Internet Explorer mode
# State: Enabled
# Scope: Computer (HKLM)
# Supported on: Microsoft Edge version 117, 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
}
$checks = @(
(Test-RegistryValue -Path 'HKLM:\Software\Policies\Microsoft\Edge' -Name 'InternetExplorerIntegrationZoneIdentifierMhtFileAllowed' -Expected 1 -Kind DWord)
)
if ($checks -notcontains $false) {
Write-Output 'Compliant'
exit 0
}
Write-Output 'Non-compliant'
exit 1
# === Remediation script ===
# Exported from gporais.com
# Policy: Automatically open downloaded MHT or MHTML files from the web in Internet Explorer mode
# State: Enabled
# Scope: Computer (HKLM)
# Supported on: Microsoft Edge version 117, Windows 7 or later
$path = 'HKLM:\Software\Policies\Microsoft\Edge'
New-Item -Path $path -Force | Out-Null
Set-ItemProperty -Path $path -Name 'InternetExplorerIntegrationZoneIdentifierMhtFileAllowed' -Value 1 -Type DWordSCCM scripts
# Exported from gporais.com
# Policy: Automatically open downloaded MHT or MHTML files from the web in Internet Explorer mode
# State: Enabled
# Scope: Computer (HKLM)
# Supported on: Microsoft Edge version 117, 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: Automatically open downloaded MHT or MHTML files from the web in Internet Explorer mode
# State: Enabled
# Scope: Computer (HKLM)
# Supported on: Microsoft Edge version 117, 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
}
$checks = @(
(Test-RegistryValue -Path 'HKLM:\Software\Policies\Microsoft\Edge' -Name 'InternetExplorerIntegrationZoneIdentifierMhtFileAllowed' -Expected 1 -Kind DWord)
)
if ($checks -notcontains $false) {
Write-Output 'Compliant'
exit 0
}
Write-Output 'Non-compliant'
exit 1
# === Remediation script ===
# Exported from gporais.com
# Policy: Automatically open downloaded MHT or MHTML files from the web in Internet Explorer mode
# State: Enabled
# Scope: Computer (HKLM)
# Supported on: Microsoft Edge version 117, Windows 7 or later
$path = 'HKLM:\Software\Policies\Microsoft\Edge'
New-Item -Path $path -Force | Out-Null
Set-ItemProperty -Path $path -Name 'InternetExplorerIntegrationZoneIdentifierMhtFileAllowed' -Value 1 -Type DWordBuilding a multi-setting collection? Add this setting and generate combined .reg / PowerShell / GPO scripts.