flags.bmp or alternatively the "outdated" flags.bmp from 'eng'
flags.conf or alternatively the "outdated" flags.conf from 'eng'
EDIT by schnurlos: It seems that 'eng' stopped with his updates
So use this one (including known US flags): http://www.should.keepfree.de/flags.zip
Guide: http://www.should.keepfree.de/Readme_FLAGS.html
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ORIGINAL TEXT BY 'eng':
The .conf doesn't have very many hosts since it only has what I've personally seen in the last few minutes. If you want me to add some more just post up the hostname and what country code it should resolve to and I'll add it, time permitting.