How to Restrict Excel File Block Settings via Group Policy
Question details
The administrator needs to enforce file-blocking policies to prevent users from bypassing security controls by clearing Save checkboxes in the Excel Trust Center.
- Product
- Microsoft Excel
- Device & OS
- not provided
- Scenario
- Deploying domain-level security policies to restrict users from changing specific Trust Center settings in Excel.
- Observed behavior
- Users can bypass intended security controls by manually clearing the Save checkboxes within the File Block Settings of the Trust Center.
Ensure you have domain administrator privileges and have downloaded the latest Microsoft Office Administrative Templates (ADMX/ADML files) for your server environment.
Enforce File Block Settings Using Office Administrative Templates
Deploy Group Policy settings using the official Office Administrative Templates to lock down Trust Center configurations and restrict user modifications.
By configuring Group Policy objects (GPO) with Office Administrative Templates, administrators can gray out the Trust Center settings for end users. This ensures compliance with organizational security policies regarding legacy or high-risk file types.
Extract your downloaded Office Administrative Templates. Copy the 'excel16.admx' file and its matching language file ('excel16.adml') to your domain's PolicyDefinitions folder (typically located at \\domain\SYSVOL\domain\Policies\PolicyDefinitions).
Open the Group Policy Management Editor and navigate to User Configuration > Administrative Templates > Microsoft Excel 2016 > Excel Options > Security > Trust Center > File Block Settings.
Locate the specific file types you want to restrict in the right pane. Double-click the policy, set it to 'Enabled', and check the 'Save blocked' option to prevent users from saving these file formats.
Apply the Group Policy Object to the appropriate Organizational Units (OUs). End users will need to restart their computers or run 'gpupdate /force' in the command prompt for the changes to take effect.
Simplify Document Security with WPS Office
If managing complex Group Policy settings in Microsoft Excel becomes burdensome, consider WPS Office as a streamlined alternative. It offers powerful built-in document protection and encryption features without the need for intricate domain-level configurations.
- 1. Download the Installer: Visit the official WPS Office website and download the free installer for your operating system.
- 2. Install WPS Office: Run the setup file and follow the on-screen prompts to install the lightweight suite.
- 3. Open and Secure Files: Open your existing spreadsheets in WPS Spreadsheet and use the 'Encrypt' feature under the Review tab to easily secure your data.
Frequently Asked Questions
What are Office Administrative Templates (ADMX/ADML)?
Administrative Templates are configuration files used by Windows Group Policy to define registry-based settings. They allow network administrators to enforce consistent security rules and application settings across all Office installations in a domain.
Why do users modify Trust Center settings?
Users typically modify Trust Center settings to bypass restrictions on macros, legacy file formats, or external data connections. While convenient for the user, this can bypass organizational security and expose the system to macro-based malware.
Can I apply File Block Settings without a domain environment?
Yes, on a standalone machine, you can use the Local Group Policy Editor (gpedit.msc) if your Windows edition supports it, or modify the registry directly. However, using Group Policy in a domain is the only scalable way to prevent multiple users from reverting the changes.
