You don't need to change the name of the .htaccess file. Instead you should check with your server administrator if the server configuration allows your .htaccess files to alter the default server settings (including the mod_rewrite one).
Quote:
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/public_html/xcart/.htaccess
...
/public_html/skins/.htaccess
...
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What is in the "xcart" directory? Where did you install X-Cart? Is it this directory, or the "public_html" one? Or do you have two X-Cart installations at the same time?