Theme Problem

[ruibinben]

Magento2-dev44
I bulid a new theme on app\design\frontend\default\xxx
I add a file on app\design\frontend\default\xxx\Mage_page\html\header.phtml
But magento can't load this file,load app\code\Mage\Page\view\frontend\html\header.phtml

[magento-team]

Hello. Unfortunately we are unable to help with customization questions or individual development problems. I suggest you move this questions to Magento forums or Magento stackexchange site http://magento.stackexchange.com/