I have checked other problems related to PIE integration with wordpress, but no result.
I have tried to add the entire url in the css behevior but, no result.
This is my code:
#website {
box-shadow: 2px 2px 5px 3px #000;
behavior: url(http://www.example.com/path/to/my/pie/htc/file/myurl.htc)
}
But no result.
I am using the latest version of WordPress.
You must put the entire website url in behavior, to have it working with Wordpress.
If the problem prospers, you can install a simple plugin: IE CSS3 Support. It uses PIE v1.
If you want to make PIE v2 functions working with this plugin:
After you the install of plugin, you can download the PIE v2(latest) an upload it in wp-content/plugins/ie-css3-support/markup (please rename the old pie to have it as a restore file). After that, you can open /wp-content/plugins/ie-css3-support/core.php file and add in the array, the other css values, that are available in the PIE v2.
EDIT
Plugin URL: http://wordpress.org/plugins/ie-css3-support/
ATTENTION: If you are using z-index in the page who uses css3, you MUST increase it! (if it is not a big number)
Hope it helps you!