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Enable MIME Sniffing: registry value 2100 (Zones\4)UserHKCU\Software\Policies\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\4

Policy ID
IZ_PolicyMimeSniffingURLaction_7
Scope
Computer Configuration, User Configuration
Supported on
At least Internet Explorer 6.0 in Windows XP with Service Pack 2 or Windows Server 2003 with Service Pack 1
Source
Administrative Templates (.admx) for Windows 11 2026 Update (26H2) (version 1.0)
Category
Windows Components › Internet Explorer › Internet Control Panel › Security Page › Restricted Sites Zone

Registry

2100

REG_DWORDUserComputer
…\Software\Policies\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\4HKCU\Software\Policies\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\4 Current key
HKLM\Software\Policies\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\4
Enabled value
Depends on the option value
Element
Enable MIME Sniffing
Options
ItemStored value
Enable0
Disable3
Apply with .reg · CMD · PowerShell
UserPer-account setting
.reg
Windows Registry Editor Version 5.00

[HKEY_CURRENT_USER\Software\Policies\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\4]

; Options (use only one)
; Enable
"2100"=dword:00000000
; Disable
"2100"=dword:00000003
CMD
:: Options (use only one)

:: Enable
reg add "HKCU\Software\Policies\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\4" /v "2100" /t REG_DWORD /d 0 /f
:: Disable
reg add "HKCU\Software\Policies\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\4" /v "2100" /t REG_DWORD /d 3 /f
PowerShell
# Common: create the key
New-Item -Path 'HKCU:\Software\Policies\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\4' -Force | Out-Null

# Options (use only one)
# Enable
New-ItemProperty -Path 'HKCU:\Software\Policies\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\4' -Name '2100' -PropertyType DWord -Value 0 -Force | Out-Null
# Disable
New-ItemProperty -Path 'HKCU:\Software\Policies\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\4' -Name '2100' -PropertyType DWord -Value 3 -Force | Out-Null
ComputerMachine-wide setting
.reg
Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\4]

; Options (use only one)
; Enable
"2100"=dword:00000000
; Disable
"2100"=dword:00000003
CMD
:: Options (use only one)

:: Enable
reg add "HKLM\Software\Policies\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\4" /v "2100" /t REG_DWORD /d 0 /f
:: Disable
reg add "HKLM\Software\Policies\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\4" /v "2100" /t REG_DWORD /d 3 /f
PowerShell
# Common: create the key
New-Item -Path 'HKLM:\Software\Policies\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\4' -Force | Out-Null

# Options (use only one)
# Enable
New-ItemProperty -Path 'HKLM:\Software\Policies\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\4' -Name '2100' -PropertyType DWord -Value 0 -Force | Out-Null
# Disable
New-ItemProperty -Path 'HKLM:\Software\Policies\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\4' -Name '2100' -PropertyType DWord -Value 3 -Force | Out-Null