For those interested. I was able to get the desired output for Visual3D by modifying the "Operators1" field. Below is the "Language" file. I hope this comes in useful to someone.
<NotepadPlus>
<UserLang name="Vis3D" ext="" udlVersion="2.1">
<Settings>
<Global caseIgnored="no" allowFoldOfComments="no" foldCompact="no" forcePureLC="0" decimalSeparator="1" />
<Prefix Keywords1="no" Keywords2="no" Keywords3="no" Keywords4="no" Keywords5="no" Keywords6="no" Keywords7="no" Keywords8="no" />
</Settings>
<KeywordLists>
<Keywords name="Comments">00!! 01 02 03 04</Keywords>
<Keywords name="Numbers, prefix1"></Keywords>
<Keywords name="Numbers, prefix2"></Keywords>
<Keywords name="Numbers, extras1"></Keywords>
<Keywords name="Numbers, extras2"></Keywords>
<Keywords name="Numbers, suffix1"></Keywords>
<Keywords name="Numbers, suffix2"></Keywords>
<Keywords name="Numbers, range"></Keywords>
<Keywords name="Operators1">/PIPELINE_PARAMETER_NAME /PROMPT /DATA_TYPE /FILE_NAME /PARAMETER_NAME /SUFFIX /SET_PROMPT /USE_POSSIBLE_VALUES /Motion_File_Names /Query /Tags /POSSIBLE_VALUES /DEFAULT_VALUES /PARAMETER_VALUE</Keywords>
<Keywords name="Operators2"></Keywords>
<Keywords name="Folders in code1, open">!**</Keywords>
<Keywords name="Folders in code1, middle"></Keywords>
<Keywords name="Folders in code1, close">!*</Keywords>
<Keywords name="Folders in code2, open"></Keywords>
<Keywords name="Folders in code2, middle"></Keywords>
<Keywords name="Folders in code2, close"></Keywords>
<Keywords name="Folders in comment, open"></Keywords>
<Keywords name="Folders in comment, middle"></Keywords>
<Keywords name="Folders in comment, close"></Keywords>
<Keywords name="Keywords1">Assign_Tags_To_Files
Set_Pipeline_Parameter_To_Folder_Path
Prompt_For_Pipeline_Parameter_Value
Open_File</Keywords>
<Keywords name="Keywords2"></Keywords>
<Keywords name="Keywords3"></Keywords>
<Keywords name="Keywords4"></Keywords>
<Keywords name="Keywords5"></Keywords>
<Keywords name="Keywords6"></Keywords>
<Keywords name="Keywords7"></Keywords>
<Keywords name="Keywords8"></Keywords>
<Keywords name="Delimiters">00 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23</Keywords>
</KeywordLists>
<Styles>
<WordsStyle name="DEFAULT" fgColor="FFFFFF" bgColor="000000" fontStyle="0" nesting="0" />
<WordsStyle name="COMMENTS" fgColor="000000" bgColor="FFFFFF" fontStyle="0" nesting="0" />
<WordsStyle name="LINE COMMENTS" fgColor="FFFFFF" bgColor="000000" fontStyle="0" nesting="0" />
<WordsStyle name="NUMBERS" fgColor="000000" bgColor="FFFFFF" fontStyle="0" nesting="0" />
<WordsStyle name="KEYWORDS1" fgColor="0080FF" bgColor="000000" fontStyle="0" nesting="0" />
<WordsStyle name="KEYWORDS2" fgColor="000000" bgColor="FFFFFF" fontStyle="0" nesting="0" />
<WordsStyle name="KEYWORDS3" fgColor="000000" bgColor="FFFFFF" fontStyle="0" nesting="0" />
<WordsStyle name="KEYWORDS4" fgColor="000000" bgColor="FFFFFF" fontStyle="0" nesting="0" />
<WordsStyle name="KEYWORDS5" fgColor="000000" bgColor="FFFFFF" fontStyle="0" nesting="0" />
<WordsStyle name="KEYWORDS6" fgColor="000000" bgColor="FFFFFF" fontStyle="0" nesting="0" />
<WordsStyle name="KEYWORDS7" fgColor="000000" bgColor="FFFFFF" fontStyle="0" nesting="0" />
<WordsStyle name="KEYWORDS8" fgColor="000000" bgColor="FFFFFF" fontStyle="0" nesting="0" />
<WordsStyle name="OPERATORS" fgColor="00FF40" bgColor="000000" fontStyle="0" nesting="0" />
<WordsStyle name="FOLDER IN CODE1" fgColor="FFFFFF" bgColor="000000" fontStyle="0" nesting="0" />
<WordsStyle name="FOLDER IN CODE2" fgColor="000000" bgColor="FFFFFF" fontStyle="0" nesting="0" />
<WordsStyle name="FOLDER IN COMMENT" fgColor="000000" bgColor="FFFFFF" fontStyle="0" nesting="0" />
<WordsStyle name="DELIMITERS1" fgColor="00FF00" bgColor="000000" fontStyle="0" nesting="0" />
<WordsStyle name="DELIMITERS2" fgColor="0080FF" bgColor="000000" fontStyle="0" nesting="2" />
<WordsStyle name="DELIMITERS3" fgColor="000000" bgColor="FFFFFF" fontStyle="0" nesting="0" />
<WordsStyle name="DELIMITERS4" fgColor="000000" bgColor="FFFFFF" fontStyle="0" nesting="0" />
<WordsStyle name="DELIMITERS5" fgColor="000000" bgColor="FFFFFF" fontStyle="0" nesting="0" />
<WordsStyle name="DELIMITERS6" fgColor="000000" bgColor="FFFFFF" fontStyle="0" nesting="0" />
<WordsStyle name="DELIMITERS7" fgColor="000000" bgColor="FFFFFF" fontStyle="0" nesting="0" />
<WordsStyle name="DELIMITERS8" fgColor="000000" bgColor="FFFFFF" fontStyle="0" nesting="0" />
</Styles>
</UserLang>
</NotepadPlus>