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Hello,
Thanks for the question about needing to set a cookie-free domain for Magento. The issue is not merely one for .htaccess configuration, but according to Magento's documentation using Cookie restriction mode, people are warned that without cookies you cannot have the full functionality provided by Magento. There are some articles that tell you how to create a cookie-free domain. Try this post which details the steps involved with setting up a "cookieless" domain.
If you have any further questions, please let us know.
Kindest regards,
Arnel C.