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DrDoc - 6:07 am on Mar 27, 2003 (gmt 0)
If it's entering, say, directly at www.example.com/deep/path/to/some/file.html the server will look for an .htaccess file in each directory, starting at the root, process any information it finds, before sending the page.
So you only need to put the .htaccess in your root directory. What if the robots enter from another area?