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dtSearch Text Retrieval Engine Programmer's Reference
IOptions::AlphabetFile Property

Name of dtSearch alphabet file to use when parsing text into words.

Syntax
IDL
__property BSTR AlphabetFile;

The alphabet file determines which characters are letters and what the rules are for handling capitalization and punctuation. If blank, a default alphabet will be used. 

The alphabet file only controls the indexing of characters in the range 32-127. Unicode character properties control the treatment of other characters.

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