OS Debian
Apache 2.2.9 with nginx in frontend
PHP 5.3.2-1
Function CFileHelper::getMimeType returns wrong info, if php version is >= 5.3.0.
here is more info http://code.google.com/p/yii/issues/detail?id=1261
and bug report on php.net site http://bugs.php.net/bug.php?id=48885