Dev drive filter attach policy: registry value FltmgrDevDriveAttachPolicyComputerHKLM\System\CurrentControlSet\Policies

Policy ID: DevDriveAttachPolicy
Scope: Computer Configuration
Supported on: At least Windows 11 Version 22H2
Source: Administrative Templates (.admx) for Windows 11 2026 Update (26H2) (version 1.0)
Category: System › Filesystem

Registry

FltmgrDevDriveAttachPolicy

REG_MULTI_SZComputer

HKLM\System\CurrentControlSet\Policies Current key

Enabled value: Depends on the option value
Element: Filter list
Value type: REG_MULTI_SZ
Required: true

Apply with .reg · CMD · PowerShell

.reg

Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\System\CurrentControlSet\Policies]

; Value names and types follow the ADMX. Replace <enter value> below with your own data
; hex(2) and hex(7) data must be written as hexadecimal (UTF-16LE)
"FltmgrDevDriveAttachPolicy"=hex(7):<enter value>

CMD

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

reg add "HKLM\System\CurrentControlSet\Policies" /v "FltmgrDevDriveAttachPolicy" /t REG_MULTI_SZ /d "<enter value>" /f

PowerShell

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

New-Item -Path 'HKLM:\System\CurrentControlSet\Policies' -Force | Out-Null
New-ItemProperty -Path 'HKLM:\System\CurrentControlSet\Policies' -Name 'FltmgrDevDriveAttachPolicy' -PropertyType MultiString -Value '<enter value>' -Force | Out-Null