Well, firstly, an extra space seems to have crept into the path for the document you specified for DirectoryIndex in your .htaccess file. Also, the Apache docs for the DirectoryIndex directive state that the document specified does not need to be 'relative to the directory', so try this instead;
deny from all
I just tried this on a test domain of mine and it seemed to work as expected.
Can I ask what you are trying to achieve with the .htaccess file?
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