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

Name of the file containing a table of filename patterns for file formats that dtSearch cannot detect automatically, such as older versions of WordStar. 

The FileTypeTableFile is an XML file. To create the file, start dtSearch Desktop, click Options > Preferences > File Types and use the dialog box to set up the file type definitions. The XML file will be saved as filetype.xml in your dtSearch UserData folder. See File Types in the dtSearch Desktop help for information on this setting.