SORRY, ATCC IS NO LONGER SUPPORTED

The old support forum can be viewed here (read-only): Old Support Forum

For a third-party ATCC-like simulator that reads ATCC sector files, try the Yahoo group http://groups.yahoo.com/group/atcwindows/ and click "Join This Group." (Provided only for information -- they are not affiliated with Xavius Software, LLC). 

Thanks to all users and supporters of Xavius' ATCC over the years!