I'm trying to load a local xml file:

xmlLoader.load(new URLRequest("../xml/xmlData.xml"));

But I'm getting this security sandbox violation:

#2148: Only local-with-filesystem and trusted local SWF files may access local resources.

I'm sure there's some very basic that I'm overlooking. (I don't get this error when I embed the XML file directly with the EMBED metadata tag.)

Can someone point me in the right direction?