Unless you have some other mod installed, browser-specific stylesheets are not going to be loaded by html_header.php unless their names start with "style". Whatever you have that is loading the IE stylesheets will be the place to look for adjusting this.
How many rules are there in ie_product_info.css? You could just put them into ie_stylesheet.css, with added selectors to give specificity so they only apply to the product info page. This would eliminate the need to override ie_stylesheet.css.



