How to enable highlighting of Unity "keywords" manually
Please take note Unity 4.3 and above no longer has UniSciTE, so there is currently no way to easily get Unity "keywords" there.
Open "C:Program FilesUnityEditorDataToolsUniSciTEunitykeywords.properties" This text file contains all the unity keywords. ("Program Files (x86)" on 64-bit systems.)
Open your Explorer and type %APPDATA% into the address bar. That will take you to the per-application settings for your user account. In there open the Notepad++ folder.
Find the langs.xml file and open it.
In langs.xml, find: `` for UnityScript files, or `` if you want highlighting to work for C# files.
You should see a list of keywords for that language. Simply copy-paste the Unity keywords from the file in step 1 to that list. They should be inside the `Keywords` tag.
Save it. Close and open Notepad++. It should highlight the Unity keywords now.