[SOLVED] Ecplise oxygen No syntax for openhab *.rules,*sitemapes,*.items

So I install this software now in order to have a netter editor for openhab rules ect. But I see that cant recognize words like items , switch , Number. …
what am I doing wrong?
http://docs.openhab.org/developers/development/ide.html This instructions followed

You downloaded Eclipse Oxygen.

If you want syntax highlighting or checking you need either Eclipse SmartHome Designer or openHAB VS Code.