Can't dynamically load XML into SWFs

I'm unable to dynamically load XML into Flash files on the server, because Shopify's asset manager uploads files to different subdomains. My guess on the main problem is Flash's new security which requires there to be a file in the server root allowing access to outside domains.

If I hard code the .xml directly into the .swf, it works just fine, but I really would like to be able to reuse certain gallery viewers and lookbooks, instead of having to create new static instances each time I want a new one.