IBM Docs Viewer can open source files with syntax highlighting. This feature is default disabled, but sometimes very useful.
You need to enable it with IBM Connections Gatekeeper.
Be aware that most of Gatekeeper settings are not officially supported by IBM and can have side effects!
Gatekeeper settings can be set in real-time, so no restart of Connections is needed to enable or disable this feature. I tested the preview with html, js and css, but I think nearly everything with mime-type text is possible.
You need the admin role of the Common Application to access the gatekeeper!