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How to Deploy an Excel VSTO Workbook from Network Locations
Question details
The user needs to correctly deploy an Excel VSTO workbook so that it functions when opened from a shared network folder instead of just its local installation directory.
- Product
- Microsoft Excel
- Device & OS
- not provided
- Scenario
- Deploying and executing an Excel VSTO workbook stored on a network location.
- Observed behavior
- The workbook works correctly in the installation folder but fails when opened from another network folder because Excel cannot locate the associated VSTO file.
Ensure you have administrative privileges to modify registry entries and verify that the target network share is accessible with read and execute permissions from the client computer.
Review Manifests, Installation Paths, and Trust Settings
Verify that your deployment files correctly point to the network share and that Excel is configured to trust the network location.
When a VSTO workbook is moved or executed from a network drive, Excel relies on the deployment manifest to locate the underlying VSTO binary. If paths are hardcoded to a local directory or if the network location is untrusted, the workbook will fail to load the add-in.
Check both the VSTO deployment manifest and the application manifest. Ensure that the workbook references the correct, fully qualified network path for the VSTO file.
Open the Windows Registry Editor and navigate to the VSTO add-in deployment keys. Confirm that the Manifest registry value points to the correct network share URL or UNC path.
Right-click the network folder, select Properties, and go to the Security tab. Ensure that the user or client application has Read and Execute permissions for the VSTO files.
Open Excel, go to File > Options > Trust Center > Trust Center Settings > Trusted Locations. Check 'Allow Trusted Locations on my network', click 'Add new location', and input your network folder path.
Consult Microsoft Developer Support Communities
If configuration adjustments do not resolve the issue, seek specific guidance from developer communities.
Try WPS Office for High-Performance Spreadsheet Needs
While VSTO add-ins are proprietary to Microsoft Office development, if you are looking for a highly compatible, fast, and lightweight spreadsheet tool for your daily business needs, WPS Spreadsheet is an excellent alternative. It offers robust performance and full compatibility with standard Excel files without complex deployment requirements.
Frequently Asked Questions
Why does my VSTO workbook work locally but not on a network drive?
This usually happens because Excel's Trust Center blocks execution from untrusted network locations by default, or the embedded application manifest contains hardcoded local file paths instead of the correct network path to the VSTO file.
How do I allow Excel to trust a network location?
Open Excel, go to File > Options > Trust Center > Trust Center Settings > Trusted Locations. Check the box for 'Allow Trusted Locations on my network', then click 'Add new location' to include your specific network folder.
Can I run Excel VSTO add-ins on WPS Office?
No, VSTO (Visual Studio Tools for Office) is a proprietary Microsoft technology designed specifically for Microsoft Office. While WPS Office supports its own add-in ecosystem and standard VBA macros, it does not execute Microsoft VSTO binaries.
