Often you develop a Flex app and don't have to worry about networked resources, as in your case where it is a local file, but when you post it to the web, you need to specify either the relative path to the file on the server, or the full URL.
Would it work if the xml file was on the same machine as the tomcat install the program is running on? The url="C:\temp\I\ietl.xml" in the code and have it running from that same machine. If it were to work in this case it should work with a mapped drive also, however.
I tried that also but it, also, didn't work. Not sure If that's exactly what you meant. I'll keep it in mind when I have to talk to the boss man though.
Thanks for answering!
Your Flex app will be hosted somewhere under the web root on the server. Just have the file somewhere under that folder if possible.