title: How can my installer optionally delete some files it didn't initially create?
body: <p>I store all my program's settings in the appdata directory %appdata%/MyProgram.  When there is a problem and the user has to reinstall, I want to ask whether to delete the data in that directory. I am using Inno Setup and added a custom page to prompt the user:</p>
  
  <pre><code>if DirExists(ExpandConstant('{userappdata}\MyProgram')) then
  begin
    appdataPage := CreateInputOptionPage(wpSelectTasks,
      'Stored Settings', 'Would you like to remove settings before re-install?',
      'Please specify if you would like to remove the current settings before re-installing MyProgram.', True, False);
    appdataPage.Add('Remove current settings (Recommended if MyProgram is having problems).');
    appdataPage.Add('Keep all my settings and just reinstall.');
    //appdataPage.Add();
    appdataPage.Values[0] := true;
  end;
  </code></pre>
  
  <p>The installer doesn't put the data there, but the program generates it, thus the uninstaller won't delete it automatically.  I also can't count on the uninstaller being run; a lot of users just run the installer again.</p>
  
  <p>How can I handle the selection from this dialog so that if they click 'remove before re-install' I delete the folder %appdata%/MyProgram?  I don't want to always delete it, but give them the option.</p>