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dtSearch Text Retrieval Engine Programmer's Reference
IOptions::UserThesaurusFile Property
__property BSTR UserThesaurusFile;

User-defined synonym sets. The UserThesaurusFile is an XML file. To create the file, start dtSearch Desktop, click Options > Preferences > User Thesaurus and use the dialog box to set up the synonym definitions. The XML file will be saved as thesaur.xml in your dtSearch UserData folder. See User Thesaurus in the dtSearch Desktop help for information on this setting.