DIRegEx: used for RegEx (regular expressions) search. asoRegEx search option is available only when this library is compiled in. After you install this library, enable its usage in ATBinHexOptions.inc and ATStreamSearchOptions.inc files, uncomment the "REGEX" define.
Tnt Unicode Controls: used for search in Unicode-named files (TTntFileStream class is used). After you install this library, enable its usage in file ATStreamSearchOptions.inc, uncomment the "TNT" define.
ATPrintPreview: used to show the "Print preview" form before the actual printing in Print and PrintPreview methods. After you install this library, enable its usage in file ATBinHexOptions.inc, uncomment the "PREVIEW" define.