Full text supports searching non-text files located in blob fields through the use of filters. When you use sp_fulltext_column you can specify then name of the column which contains the file type. In this column you specify the format of the file contained within the IMAGE columns (.doc, .xls, .ppt, .txt or .htm by default). Download the revised edition of Books Online from Microsoft and search for the "filtering supported file types" topic.
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This was first published in November 2002