When CTF files are exported, an XML export file is created and stored in the CTF Export Directory that was specified when you configured the CTF defaults (via Tools | Setups | CTF). Each XML file will have an individual file name when viewed through Windows® Explorer. The first seven digits of the file name are your Local Authority (LA) number and your establishment number as the sending school. The other seven digits represent the LA and establishment number of the receiving school. Over time, a number of files may have been created that are no longer required. Navigate to the CTF Export Directory and delete any files that are not required using the Date Modified field to determine which files of the same name should be kept.