latcomsystems

function lcs_em_ical_item(){
	global $wpdb, $wp_query, $wp_rewrite;
	//check if we're outputting an ical feed
	if( !empty($wp_query) && $wp_query->get('ical') ){
		$execute_ical = false;
		$filename = 'events';
		$args = array();
		//single event
		if( $wp_query->get(EM_POST_TYPE_EVENT) ){
			$event_id = $wpdb->get_var('SELECT event_id FROM '.EM_EVENTS_TABLE." WHERE event_slug='".$wp_query->get(EM_POST_TYPE_EVENT)."' AND event_status=1 LIMIT 1");
			if( !empty($event_id) ){
				$filename = $wp_query->get(EM_POST_TYPE_EVENT);
				$args['event'] = $event_id;
			}
		//single location
		}elseif( $wp_query->get(EM_POST_TYPE_LOCATION) ){
			$location_id = $wpdb->get_var('SELECT location_id FROM '.EM_LOCATIONS_TABLE." WHERE location_slug='".$wp_query->get(EM_POST_TYPE_LOCATION)."' AND location_status=1 LIMIT 1");
			if( !empty($location_id) ){
				$filename = $wp_query->get(EM_POST_TYPE_LOCATION);
				$args['location'] = $location_id;
			}
		//taxonomies
		}else{
			$taxonomies = EM_Object::get_taxonomies();
			foreach($taxonomies as $tax_arg => $taxonomy_info){
				$taxonomy_term = $wp_query->get($taxonomy_info['query_var']);
				if( $taxonomy_term ){
					$filename = $taxonomy_term;
					$args[$tax_arg] = $taxonomy_term;
				}
			}
		}
		//only output the ical if we have a match from above
		if( count($args) > 0 ){
			//send headers and output ical
			header('Content-type: text/calendar; charset=utf-8');
			header('Content-Disposition: attachment; filename="'.$filename.'.ics"');
			em_locate_template('templates/ical.php', true, array('args'=>$args));
			exit();
		}else{
			//no item exists, so redirect to original URL
			$url_to_redirect = preg_replace("/ical\/$/",'', esc_url_raw(add_query_arg(array('ical'=>null))));
			wp_redirect($url_to_redirect, '302');
			exit();
		}
	}
}
remove_action('parse_query', 'em_ical_item');
add_action ( 'parse_query', 'lcs_em_ical_item', 1 );

That didn’t make a difference. You can check here:
http://thoughtgallery.org/events-2/
Click on any of the iCal links in the list of events. It takes you to a browser page with VCALNDAR code instead of opening a file.

This is what the formatting looks like:

<tr>

<td width=”150″>

#_EVENTDATES<br/>

#_EVENTTIMES

</td>

<td width=”*”>

#_EVENTLINK

{has_location}<br/><i>#_LOCATIONLINK, #_LOCATIONTOWN #_LOCATIONSTATE</i>{/has_location}

</td>

<td width=”50″>#_EVENTICALLINK</td>

</tr>