Remove index.php from WP 8.0 install migrated to IIS from Apache (still detecting Apache server)?

WP has global $is_iis7 variable, which is filled via following code: $is_iis7 = $is_IIS && intval( substr( $_SERVER[‘SERVER_SOFTWARE’], strpos( $_SERVER[‘SERVER_SOFTWARE’], ‘Microsoft-IIS/’ ) + 14 ) ) >= 7; If detection is not working correctly likely something is going wrong with this line, such as server vars not being filled with the info expected.