Default risk level for file attachments: registry value DefaultFileTypeRiskUserHKCU\Software\Microsoft\Windows\CurrentVersion\Policies\Associations

Policy ID: AM_SetFileRiskLevel
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

DefaultFileTypeRisk

REG_DWORDUser

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

Enabled value: Depends on the option value
Element: Set the default risk level

Options
Item	Stored value
High Risk	6150
Moderate Risk	6151
Low Risk	6152

Apply with .reg · CMD · PowerShell

.reg

Windows Registry Editor Version 5.00

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

; Options (use only one)
; High Risk
"DefaultFileTypeRisk"=dword:00001806
; Moderate Risk
"DefaultFileTypeRisk"=dword:00001807
; Low Risk
"DefaultFileTypeRisk"=dword:00001808

CMD

:: Options (use only one)

:: High Risk
reg add "HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\Associations" /v "DefaultFileTypeRisk" /t REG_DWORD /d 6150 /f
:: Moderate Risk
reg add "HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\Associations" /v "DefaultFileTypeRisk" /t REG_DWORD /d 6151 /f
:: Low Risk
reg add "HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\Associations" /v "DefaultFileTypeRisk" /t REG_DWORD /d 6152 /f

PowerShell

# Common: create the key
New-Item -Path 'HKCU:\Software\Microsoft\Windows\CurrentVersion\Policies\Associations' -Force | Out-Null

# Options (use only one)
# High Risk
New-ItemProperty -Path 'HKCU:\Software\Microsoft\Windows\CurrentVersion\Policies\Associations' -Name 'DefaultFileTypeRisk' -PropertyType DWord -Value 6150 -Force | Out-Null
# Moderate Risk
New-ItemProperty -Path 'HKCU:\Software\Microsoft\Windows\CurrentVersion\Policies\Associations' -Name 'DefaultFileTypeRisk' -PropertyType DWord -Value 6151 -Force | Out-Null
# Low Risk
New-ItemProperty -Path 'HKCU:\Software\Microsoft\Windows\CurrentVersion\Policies\Associations' -Name 'DefaultFileTypeRisk' -PropertyType DWord -Value 6152 -Force | Out-Null