Use this filed to specify the full text search stop list file.
 
A stop list decreases the size of the full-text search index, which results in a smaller compiled help (.CHM) file because fewer words are indexed. This is especially important if you have a large documentation set. All words in the stop list are omitted from the search. These are usually commonly occurring words or numbers, such as "the," "and," or "1" that a user is unlikely to search for.