anchor.diff:  begin
     CEMainForm.FormDropFiles(Sender, Filenames);
     if fProject = nil then exit;
  -  for fname in Filenames do fProject.addSource(fname);
  +  for fname in Filenames do
  +    if FileExists(fname) then
  +      fProject.addSource(fname);
   end;
   
   procedure TCEProjectInspectWidget.UpdateByEvent;
  
positive.code:   begin
      if fold = '' then
        continue;
      itm := Tree.Items.AddChild(fImpsNode, shortenPath(symbolExpander.get(fold)));
      itm.ImageIndex := 5;
      itm.SelectedIndex := 5;
    end;
  
negative.code:   Tree.BeginUpdate;
    // display main sources
    for src in fProject.Sources do
    begin
      itm := Tree.Items.AddChild(fFileNode, src);
      itm.ImageIndex := 2;
      itm.SelectedIndex := 2;
    end;
    // display configurations
    for i := 0 to fProject.OptionsCollection.Count-1 do
    begin
  