path problem in setup file in winform application

Question

i crated one sample application Winform application. it contains 3 projects and one main project. in that main project i added all 3 projects dll's. now i created setup file. it's working fine. in my second project i created on e folder and i kept some file in it. when only my application running it takes correct path for that path. when i create's a setup file ,the folder path not accessing.
 
in my application coding wise i used to get path for folder is application.startup + Folderpath property. when i created setup file it shows only dll but not exact file.
how to get the path ?