Thanks for reply.
I am working with cs4 and i could not export the English:USA list to text.
(you mean all the dictionary words in English USA language).
I think only externally added words can be exported. But here,
I need to change hyphenation for existing words in English:USA language.
how to do this.
Sorry it seemed as if I suggested you could export the whole dictionary -- small misunderstanding. It is not possible to replace the hyphenation pattern of internal words (many words are hyphenated by algorithm anyway, I would think). The list of added words is used to override the internal hyphenation rules, so just add the words you received after placing the correct hyphenation points. This in effect replaces the word in the main dictionary.