How do you add a database file to a ClickOnce deployed C# Outlook add-in?

Question

I am trying to set up a click-once deployment for an Outlook add-in in C# that uses a CE database. I found this site: http://msdn.microsoft.com/en-us/library/6fehc36e.aspx which purports to be a method to add any file to a click-once app. However, when I follow the directions which say to add the database file to the appropriate application files sub-directory in the deployment directory and then edit the manifest with MageUI, I keep getting the error "Files page - No entry point specified" when I try to save the changes. I'm not sure what to do next, having had zero experience with editing manifests.

The file types present are:

[app_name].dll.config.deploy

[app_name].dll.deploy

[app_name].dll.manifest

[app_name].vsto

[app_name]DataBase.sdf (I had to add this one by hand)

Any ideas out there?