What on earth is this file: /oenntp/OEAppConfig.xml ?

The users of a NNTP news site using Outlook Express news reader, keep hitting our web server asking to serve this file few thousand times a day.

If anyone can give me the XML file format of this file, I will gladly buy them a few beers.

I am guessing that this file is generated by the Microsoft NNTP server somehow and Outlook express loads it from port 80 or nntp.