Ham radio call signs start with prefixes that indicate which country issued their license. The country files are listings of these prefixes together with exceptions for use in logging software. The Super Check Partial database files provide a list of call signs used by active contesters.

Contained files: * cty.csv, cty.dat ("bigcty" from country-files.com) * MASTER.SCP (from supercheckpartial.com) * WAG_call_history.txt (from www.dk9tn.de/downloads.php)