Calling RH_ShowLocalHelp with 5 arguments

Hello all,

I'm trying to make a context-sensitive help call from C#. According to the documentation at http://help.adobe.com/en_US/robohelp/robohtml/WS5b3ccc516d4fbf351e63e3d11aff59c571-7f39.html , there's a function named RH_ShowLocalHelp that takes 5 parameters. Unfortunately, that function seems to be missing from the C# files that ship with RoboHelp 10 (the 4 arguments' version is in the file, though). Am I missing something in here? Am I not using the right files?

Thanks in advance,

--Ignacio