Open your existing wordfile in UltraEdit, by going to "Advanced | Configuration", 
and selecting "Syntax Highlighting" from the Navigation group "Editor Display".
Click on the "Open" button next to the path to the current wordlist file.
 
Append VBS_Scripts.txt to the end of the current wordfile (or, if the section already exists,
overwrite it). 

The first line of the language definition sections starts with /L19 and /L20 
(this indicates the index of the language, with a maximum of 20).
Make sure there is no other section that has the same index. 
If there is one already, find a free index, and use that one instead for the added sections.

 
More instructions are available here: 
http://www.ultraedit.com/support/tutorials_power_tips/ultraedit/add_a_wordfile_pre_v15.html
  