Excel 3 macrosheets and add-in files: registry value xl3macrosUserHKCU\software\policies\microsoft\office\16.0\excel\security\fileblock

Policy ID: L_Excel3MacrosheetsAndAddInFiles
Scope: User Configuration
Supported on: At least Windows Server 2008 R2 or Windows 7
Source: Microsoft 365 Apps / Office Administrative Templates (version 5568.1000)
Category: Microsoft Excel 2016 › Excel Options › Security › Trust Center › File Block Settings

Registry

xl3macros

REG_DWORDUser

HKCU\software\policies\microsoft\office\16.0\excel\security\fileblock Current key

Enabled value: Depends on the option value
Element: File block setting:

Options
Item	Stored value
Do not block	0
Open/Save blocked, use open policy	2
Block	3
Open in Protected View	4
Allow editing and open in Protected View	5

Apply with .reg · CMD · PowerShell

.reg

Windows Registry Editor Version 5.00

[HKEY_CURRENT_USER\software\policies\microsoft\office\16.0\excel\security\fileblock]

; Options (use only one)
; Do not block
"xl3macros"=dword:00000000
; Open/Save blocked, use open policy
"xl3macros"=dword:00000002
; Block
"xl3macros"=dword:00000003
; Open in Protected View
"xl3macros"=dword:00000004
; Allow editing and open in Protected View
"xl3macros"=dword:00000005

CMD

:: Options (use only one)

:: Do not block
reg add "HKCU\software\policies\microsoft\office\16.0\excel\security\fileblock" /v "xl3macros" /t REG_DWORD /d 0 /f
:: Open/Save blocked, use open policy
reg add "HKCU\software\policies\microsoft\office\16.0\excel\security\fileblock" /v "xl3macros" /t REG_DWORD /d 2 /f
:: Block
reg add "HKCU\software\policies\microsoft\office\16.0\excel\security\fileblock" /v "xl3macros" /t REG_DWORD /d 3 /f
:: Open in Protected View
reg add "HKCU\software\policies\microsoft\office\16.0\excel\security\fileblock" /v "xl3macros" /t REG_DWORD /d 4 /f
:: Allow editing and open in Protected View
reg add "HKCU\software\policies\microsoft\office\16.0\excel\security\fileblock" /v "xl3macros" /t REG_DWORD /d 5 /f

PowerShell

# Common: create the key
New-Item -Path 'HKCU:\software\policies\microsoft\office\16.0\excel\security\fileblock' -Force | Out-Null

# Options (use only one)
# Do not block
New-ItemProperty -Path 'HKCU:\software\policies\microsoft\office\16.0\excel\security\fileblock' -Name 'xl3macros' -PropertyType DWord -Value 0 -Force | Out-Null
# Open/Save blocked, use open policy
New-ItemProperty -Path 'HKCU:\software\policies\microsoft\office\16.0\excel\security\fileblock' -Name 'xl3macros' -PropertyType DWord -Value 2 -Force | Out-Null
# Block
New-ItemProperty -Path 'HKCU:\software\policies\microsoft\office\16.0\excel\security\fileblock' -Name 'xl3macros' -PropertyType DWord -Value 3 -Force | Out-Null
# Open in Protected View
New-ItemProperty -Path 'HKCU:\software\policies\microsoft\office\16.0\excel\security\fileblock' -Name 'xl3macros' -PropertyType DWord -Value 4 -Force | Out-Null
# Allow editing and open in Protected View
New-ItemProperty -Path 'HKCU:\software\policies\microsoft\office\16.0\excel\security\fileblock' -Name 'xl3macros' -PropertyType DWord -Value 5 -Force | Out-Null