Prohibit flyweight patching: registry value DisableFlyweightPatchingComputerHKLM\Software\Policies\Microsoft\Windows\Installer

Policy ID: DisableFlyweightPatching
Scope: Computer Configuration
Supported on: Windows Installer v3.0
Source: Administrative Templates (.admx) for Windows 11 2026 Update (26H2) (version 1.0)
Category: Windows Components › Windows Installer

Registry

DisableFlyweightPatching

REG_DWORDComputer

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

Enabled value: Depends on the option value
Element: Prohibit Flyweight Patching

Options
Item	Stored value
Patch Optimization Off	1
Patch Optimization On	0

Apply with .reg · CMD · PowerShell

.reg

Windows Registry Editor Version 5.00

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

; Options (use only one)
; Patch Optimization Off
"DisableFlyweightPatching"=dword:00000001
; Patch Optimization On
"DisableFlyweightPatching"=dword:00000000

CMD

:: Options (use only one)

:: Patch Optimization Off
reg add "HKLM\Software\Policies\Microsoft\Windows\Installer" /v "DisableFlyweightPatching" /t REG_DWORD /d 1 /f
:: Patch Optimization On
reg add "HKLM\Software\Policies\Microsoft\Windows\Installer" /v "DisableFlyweightPatching" /t REG_DWORD /d 0 /f

PowerShell

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

# Options (use only one)
# Patch Optimization Off
New-ItemProperty -Path 'HKLM:\Software\Policies\Microsoft\Windows\Installer' -Name 'DisableFlyweightPatching' -PropertyType DWord -Value 1 -Force | Out-Null
# Patch Optimization On
New-ItemProperty -Path 'HKLM:\Software\Policies\Microsoft\Windows\Installer' -Name 'DisableFlyweightPatching' -PropertyType DWord -Value 0 -Force | Out-Null