Rich text widget shows a path error in IE9

We are using the Rich text editor in advanced modus in MX4.1. When showing this in IE9 the platform logs an error. The error is: 404 - file not found for file: widgets/RichText/widget/lib/tinymce/widgets/RichText/widget/lib/tinymce/themes/advanced/skins/default/content.css This does not happen in other browsers. How can this be solved for the IE version?
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