got a bad file

I asked www4mail@web.bellanet.org some wave files from http://www.wordsmith.org/words/ with XGET command, and I got files of 1.5KBytes each, and the system doesn't recognize them as valid. Could you help me? 

I repeat here the contents of my request:
xget http://www.wordsmith.org/words/picayune.wav
xget http://www.wordsmith.org/words/excelsior.wav
xget http://www.wordsmith.org/words/logograph.wav
xget http://www.wordsmith.org/words/beacon.wav
xget http://www.wordsmith.org/words/epigraph.wav