Google Desktop Search Outlook add-in removal problems

I uninstalled the Google Desktop Search Outlook add in, however,  it didn’t appear to have cleaned up completely.  Starting Outlook,  I kept getting “The add-in “Google Desktop Search Outlook Addin” …cannot be loaded and has been disabled by Outlook. Please contact the Add-in manufacturer for an update. If no update is available, please uninstall the Add-in.”

What worked was to locate and remove the following file:

C:\Users\YourName\AppData\Local\Microsoft\Outlook\extend.dat