No matter which size is my viewport, the narrow.css file is the only one triggered with IE7 and IE8 in my Omega site I´m using Omega theme in D7.
After configuring all the .css files to achieve an adaptive design, I realize that ie7 and ie8 looks like hell.

The problem? The different css files (that have different codes according to different mediaqueries) are not triggered.

No matter which size is my viewport, the "narrow.css" file is all I see.
Not even the default.css

Is there a workaround to this?

Thanks!
You can load css file by using this code:

drupal_add_css(path_to_theme() . '/css/ie8.css', array(
  'weight' =&gt; 999, 
  'browsers' =&gt; array('
      !IE' =&gt; FALSE, 
      'IE' =&gt; '(lt IE 9)&amp;(!IEMobile)'), 
      'group' =&gt; CSS_THEME)
);


== 2nd option ==

try Respond.js module 


  This Drupal module provides IE 6-8 support for responsive themes.