This file adds syntax highlighting for any editor which allows gtksourceview (e.g. gedit).

You will need to move it to the appropriate folder.
For linux, probably /usr/share/gtksourceview-2.0/language-specs
For windows, probably Program Files (x86)/gedit/share/gtksourceview-2.0/language-specs

If you have version 3.0 of gtksourceview, then the folders are:
For linux, probably /usr/share/gtksourceview-3.0/language-specs
For windows, probably Program Files (x86)/gedit/share/gtksourceview-3.0/language-specs