In response to a request which (IIRC) appeared on this list not so long ago, the bwrite() function -- which writes gretl bundles to XML -- now supports the .gz extension. <hansl> bundle b matrix b.m = I(1000) string b.s = "Just testing" bwrite(b, "b.xml") # uncompressed bwrite(b, "b.xml.gz") # gzip-compressed bundle b2 = bread("b.xml") print b2 bundle b3 = bread("b.xml.gz") print b3 eval maxc(maxr(abs(b3.m - b2.m))) </hansl> The last result should be 0. And on this machine I'm seeing: -rw-rw-r-- 1 allin allin 2001243 Dec 11 21:18 b.xml -rw-rw-r-- 1 allin allin 6982 Dec 11 21:18 b.xml.gz (Less compression will be achieved if the bundle contains big "random" data.) Allin