The standard configuration files (app.config and dll.config) which are created by the Visual Studio 2010 "Settings" editor in C# are not being included in an ArcMap add-in project.
Steps to reproduce using ArcGIS 10.0 and Visual Studio 2010
* create a new ArcMapAddin project
* create a new Windows Forms application
* in the Forms project, add a Settings file (RMB on project / Properties / Settings tab)
* add an Application (not User) setting - this causes the project's "app.config" file to be created
* reference the Forms project from the ArcMapAddin project
Build the solution and look in the ArcMapAddin project's output directory - it has copied the Form project's .exe and .pdb as expected, but it forgot the "exe.config".
I get the same behavior when referencing a ClassLibrary (aka .dll) project from the Addin [remember that as of .NET 2, ClassLibrary projects can have their own "dll.config" files].
Can anyone reproduce this behavior? Thanks!