I released a freeware editor for MASTER.DTA a couple of days ago.
MASTER.DTA is a master callsign database file used in many contesting
programs for partial callsign checking. With this editor, you can
view and edit the database, import and export callsigns, and auto-
download announced DX operations.
Download the editor from http://www.netvampire.com/ham
73 Alex VE3NEA