Uninstall setup file

Question

Hi,

     I have create setup file for instal my application in .net 2008.

     I have created one xml file in my app in run time.The file is created when i install and run the .exe

     But I am trying to uninstall the app It can not remove that xml file located in installtion path(c:/programfiles/app/sample.xml).

It will remove only the exe file.So I want to remove all the files when I uninstall the app.