Resolving "Not a Valid Short File Name" Error During Add-in Installation

Steps to Resolve

1. Verify the Personal Registry Key:

   • Open the Registry Editor (press Win + R, type regedit, and press Enter).

   • Navigate to:
     HKEY_CURRENT_USER\\SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Explorer\\User Shell Folders

   • Check the value for the Personal key. If it points to a network drive (e.g., \\ServerName\\FolderName\\Documents), proceed to the next steps.

2. Option 1: Change the Personal Key to a Local Path

   • Edit the Personal key value to %USERPROFILE%\\Documents.

   • Close the Registry Editor and attempt the installation again.

3. Option 2: Use a Local Administrator Account

   • Create a local administrator account without a redirected profile.

   • Log in as the administrator and run the MSI installer.

   • Switch back to the end user’s account after installation.

4. Post-Installation Check:

   • Confirm the plugin appears in Excel under the desired user account. If it does not, retry the installation using the administrator account or consult the references below.

Additional Resources:

• Desktop Client: Installation Error 1325 : not a valid short file name

• “Error 1327. Invalid Drive” or “Error 1325 – not a valid short file name” Fix

• .NET Framework - Error 1325 is not a valid short file name - Super User

If the error persists, please contact EBM Support for further assistance.

Resolving the "not a valid short file name" error often requires adjusting the registry or using a local administrator account. Following the outlined steps should address the issue in most cases. If problems continue, reference the additional resources or contact EBM Support for expert help.