Fix Visual Studio Excel Customization Trusted Locations Error
Question details
The user is unable to load custom code in an Excel document via Visual Studio Community 2022 due to a trusted locations error, even though the location is already trusted in both applications.
- Product
- Microsoft Excel and Visual Studio Community 2022
- Device & OS
- not provided
- Scenario
- Developing or running an Excel document-level customization using Visual Studio.
- Observed behavior
- Visual Studio reports that the Excel document contains custom code that cannot be loaded because its location is not in the trusted locations list, despite the path being manually trusted.
Ensure you have administrative privileges on your computer, as modifying deep Trust Center settings, network permissions, and Visual Studio project properties often requires elevated permissions.
Verify Network and Subfolder Settings in Excel Trust Center
Ensure that network locations are explicitly allowed and that subfolder permissions are granted, which is a common reason trusted paths fail to register properly.
Even if a folder is added to the Trusted Locations list, Excel might silently block it if the folder resides on a mapped network drive or if the compiled DLLs are located in a deeply nested subfolder that wasn't granted explicit trust.
Launch Microsoft Excel, navigate to File > Options, click on Trust Center in the left sidebar, and then click the Trust Center Settings button.
Select Trusted Locations from the left menu. If your Visual Studio project is saved on a network drive, check the box at the bottom that says 'Allow Trusted Locations on my network (not recommended)'.
Find your project's path in the list, select it, and click Modify. Ensure the box for 'Subfolders of this location are also trusted' is checked, then click OK to save changes.
Consult Microsoft Q&A Development Experts
If the issue persists despite correct configurations, it may involve deep document-level customization bugs that require specialized developer assistance.
Try WPS Office for a Lightweight and Compatible Experience
If you are struggling with complex Excel configuration issues and heavy development environments, consider WPS Office for your standard spreadsheet tasks. It's a free, lightweight alternative that bypasses the heavy overhead of complex customization frameworks.
Frequently Asked Questions
Why does Excel ignore my trusted location setting in Visual Studio?
Excel might ignore a trusted location if the file is stored on a network drive and the 'Allow Trusted Locations on my network' option is disabled. Additionally, missing subfolder permissions or incorrect path formatting in the Trust Center can cause Excel to reject the custom code.
Can I disable trusted locations completely in Excel to bypass this?
While you can choose to disable all trusted locations via the Trust Center Settings, doing so will block all active content like macros and document-level customizations from running automatically. This will prevent your Visual Studio custom code from executing entirely.
Does WPS Office support Visual Studio Excel customizations?
No, Visual Studio Tools for Office (VSTO) and specific document-level customizations are proprietary to Microsoft Office. However, WPS Office provides excellent support for standard VBA macros and JavaScript-based APIs for developers seeking a lighter alternative.
