The "C" pretty printer will apply syntax highlighting to almost any file it is fed. This is managed by 2 files found in its data folder, c2html.css (the style sheet) and keywords.ini.
To change the colors or font styles used for highlighting edit the stylesheet file. There are a number of namespace extensions used for the code namespace. For example, the "UserWord" name subspace is used to determine the formating of the words found in keywords.ini
To change the user defined words, edit keywords.ini. An important note: only one word per line.