Back when I was in MS Customer Support found that IE was going out os support so *FREB traces would not be readable under normal server browser .
For this i wrote 🔭 FrebToHMTL Utility to convert XML Freb traces to HTML with all features Taking IIS Failed Request Traces that need an XML and and XSL to render and converting them to a self-contained HTML.
If you want to have a look you can find it on GITHUB!!