adding a pe section problem

[taos]

Hi!!

I'm testing several apps to add a new section in its header but I have a problem.
When I add a new section in SOME APP's I have a error.
I use IIDKING, TOPO, or Snippet creator to add a new section in CALC.EXE (popular calculator from Windows XP SP1) and when I run the app I have a error msg. Only IIDKING tell me that "...has no room in its PE section header to add new sections...).
In other apps I can add new sections but in calc.exe NO

can anyone explain why and how I can do it?

Regards.