#6 Wrong Substition for Report-Folder

I export a HTML_Report_hierarchic.xml

filename: Überdeckungsbericht.html
automatically generated folder name: Überdeckungsbericht.html-files

css-import:
<link rel="stylesheet" type="text/css" href="%dcberdeckungsbericht.html-files/style.css">
<script src="%dcberdeckungsbericht.html-files/sorttable.js" type="text/javascript"></script>

So the style sheet is not working at the top page