dagerman, your explanations are not enough clear . I cannot disagree that a pic talks a much, but it should be accompanied by proper explanation . BTW, I am asking you a few questions .
1. Did you try to open a dll file with winrar ?
2. What is the iconpack you do use ? Is it a stardock product, or a an installer script, or a 7tsp thing ?
After getting the precise answers of this two questions, we may ask you a few more questions , depending upon your answer, but it is possible to fix, surely .
If you want to fix your issue by getting back the default icons , that is the easiest one . Let us know.