Hey @Kai, thanks! I’m glad everything is working. The 4th and 5th options are in there to address communities outside of openHAB. Are you sure we need them here?
@watou, you are totally right that using csv and php is a simple hack and not the ideal solution. The plugin only solves halve the problem, the other halve would be to define our own syntax highlighting, I linked something related to that in the thread. What do you mean by “default”? I tested a typical items file and rule file with different syntax highlightings available and found those the not-perfect-but-best-suited ones 
If you find others better fitting I can exchange them in the plugin. Would be better if someone would take up the task to implement a basic highlighting for openhab.
Further discussion over here? Discourse plugin for openHAB Community