Executing C#.net

I am working on an existing C#.net 2008 desktop application that has a large numer of project files in one solution. This solution can be executed many ways depending upon what the startup project is. However there is one project file that is generally the main 'startup project'. This application also has no setup and deployment currently.
What I am trying to do is to determine what exes, dll's, config files are needed to be combined together so I can deploy them? Is there certain directory paths I can use to determine what files I need? Is there some kind of a way I can test the combined files to determine what files work together so I can deploy them?