Inclusion list for high risk file types: registry value HighRiskFileTypesUserHKCU\Software\Microsoft\Windows\CurrentVersion\Policies\Associations

Policy ID: AM_SetHighRiskInclusion
Scope: User Configuration
Supported on: At least Windows XP Professional with SP2
Source: Administrative Templates (.admx) for Windows 11 2026 Update (26H2) (version 1.0)
Category: Windows Components › Attachment Manager

Registry

HighRiskFileTypes

REG_SZUser

HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\Associations Current key

Enabled value: Depends on the option value
Element: Specify high risk extensions (include a leading period, e.g. .cmd;.exe;).
Value type: REG_SZ
Required: true

Apply with .reg · CMD · PowerShell

.reg

Windows Registry Editor Version 5.00

[HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Associations]

; Value names and types follow the ADMX. Replace <enter value> below with your own data
"HighRiskFileTypes"="<enter value>"

CMD

:: Value names and types follow the ADMX. Replace <enter value> below with your own data

reg add "HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\Associations" /v "HighRiskFileTypes" /t REG_SZ /d "<enter value>" /f

PowerShell

# Value names and types follow the ADMX. Replace <enter value> below with your own data

New-Item -Path 'HKCU:\Software\Microsoft\Windows\CurrentVersion\Policies\Associations' -Force | Out-Null
New-ItemProperty -Path 'HKCU:\Software\Microsoft\Windows\CurrentVersion\Policies\Associations' -Name 'HighRiskFileTypes' -PropertyType String -Value '<enter value>' -Force | Out-Null