Polluted with Verilog
From Klaus' wiki
Sometimes you may install other plugins into Eclipse, but this can also create unwanted behaviour from Eclipse when working with e.g. C or C++. Such a problem creates the Verilog plugin. Eclipse doesn't recognise header files (*.h) with the correct editor anymore - see the first picture below.
Valod has found a way around this. Do follow the instructions below to fix the problem.