Unpack .dz file. read *.dict.dz, *.dict

.dz is just .bz file. It is Stardict dictionary data file. And inside it is XML file (looks like). To unpack run:

gunzip filename.dict.dz -S .dz

For ruby You could read it using GZip reader and process as xml using nokogiri.

require 'nokogiri'
require 'zlib'
include Zlib
data = GzipReader.open("dict.dict.dz"){|f|f.read}
doc = Nokogiri::XML(data)
p doc.xpath("k")[0].content