Ancestry's definition of Millenium File "created by the Institute of Family Research to track the records of its clients and the results of its professional research. It contains more than 880,000 linked family records, with lineages from throughout the world, including colonial America, the British Isles, Switzerland, and Germany. Many of these lineages extend back to nobility and renowned historical figures. In fact, one of the things the Millennium File focuses on is linking to European nobility and royalty."
Comment from Me: If it says linking to nobility - BEWARE!