Prevent users' app data from being stored on non-system volumes: registry value RestrictAppDataToSystemVolumeComputerHKLM\Software\Policies\Microsoft\Windows\Appx

Policy ID: RestrictAppDataToSystemVolume
Scope: Computer Configuration
Supported on: At least Windows 8.1 Update 2
Source: Administrative Templates (.admx) for Windows 11 2026 Update (26H2) (version 1.0)
Category: Windows Components › App Package Deployment

Registry

RestrictAppDataToSystemVolume

REG_DWORDComputer

HKLM\Software\Policies\Microsoft\Windows\Appx Current key

Enabled value: 1
Disabled value: 0

Apply with .reg · CMD · PowerShell

.reg

Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Windows\Appx]

; Options (use only one)
; Enabled
"RestrictAppDataToSystemVolume"=dword:00000001
; Disabled
"RestrictAppDataToSystemVolume"=dword:00000000

CMD

:: Options (use only one)

:: Enabled
reg add "HKLM\Software\Policies\Microsoft\Windows\Appx" /v "RestrictAppDataToSystemVolume" /t REG_DWORD /d 1 /f
:: Disabled
reg add "HKLM\Software\Policies\Microsoft\Windows\Appx" /v "RestrictAppDataToSystemVolume" /t REG_DWORD /d 0 /f

PowerShell

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

# Options (use only one)
# Enabled
New-ItemProperty -Path 'HKLM:\Software\Policies\Microsoft\Windows\Appx' -Name 'RestrictAppDataToSystemVolume' -PropertyType DWord -Value 1 -Force | Out-Null
# Disabled
New-ItemProperty -Path 'HKLM:\Software\Policies\Microsoft\Windows\Appx' -Name 'RestrictAppDataToSystemVolume' -PropertyType DWord -Value 0 -Force | Out-Null