Do not preserve zone information in file attachments: registry value SaveZoneInformationUserHKCU\Software\Microsoft\Windows\CurrentVersion\Policies\Attachments

Policy ID: AM_MarkZoneOnSavedAtttachments
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

SaveZoneInformation

REG_DWORDUser

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

Enabled value: 1
Disabled value: 2

Apply with .reg · CMD · PowerShell

.reg

Windows Registry Editor Version 5.00

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

; Options (use only one)
; Enabled
"SaveZoneInformation"=dword:00000001
; Disabled
"SaveZoneInformation"=dword:00000002

CMD

:: Options (use only one)

:: Enabled
reg add "HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\Attachments" /v "SaveZoneInformation" /t REG_DWORD /d 1 /f
:: Disabled
reg add "HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\Attachments" /v "SaveZoneInformation" /t REG_DWORD /d 2 /f

PowerShell

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

# Options (use only one)
# Enabled
New-ItemProperty -Path 'HKCU:\Software\Microsoft\Windows\CurrentVersion\Policies\Attachments' -Name 'SaveZoneInformation' -PropertyType DWord -Value 1 -Force | Out-Null
# Disabled
New-ItemProperty -Path 'HKCU:\Software\Microsoft\Windows\CurrentVersion\Policies\Attachments' -Name 'SaveZoneInformation' -PropertyType DWord -Value 2 -Force | Out-Null