OpenIndiana Distribution

Navigating to the Oi mailing lists on:
http://openindiana.org/mailman/listinfo/
,clicking on the list then going into list archives, and clicking on downloadable version archive (YYYY-Month.txt,gz)
gives gzip archive that can be unpacked, but includes unreadable content instead of text file with the archive.

For example, http://openindiana.org/pipermail/openindiana-discuss/2010-July.txt.gz
can't be opened in gedit, after unpacking it.
Local BE date 2016-07-14 16:20, userland-incorporation 0.5.11-2016.0.0.6934

I don't know for how long that mailing list archives bug is on stage or os it broken by mistake or by intention, because I am on ML "forever" and I don't remember downloading archives before.

This being as example of what seems the binary file instead of the text file:
......TL../opt/mailman/archives/private/openindiana-discuss/2010-July.txt..U]S.0.}.....;K........UT..\uwv.....MR...M.2.. ..}jnrO.=9'.......(`...0.P...e.:rx..`..[.f.....k.'...y..l.N....|U.H`;...`)f..zq..M.4...F./l.....I.............0..........o...J....c.j..-...K.M.jX..........L1...x.D.......Ej.}.H....D .?....;C..M.^..0Q.t../..3L..o..D...8.w.h.>...8.......{.%~.....V...s^.g.........0...&3B..%...r`....0aTr.Tg.T....>.....n..!...+..J......eC..N.{;..1.O."D.)\@.tq.3..~&.u.X....{1C.X..)c+.~.r.%.{..Qpk.j..O-x........8.....SY.TnP..v}A.....(2Zs..nx......UH..i...".....xc}sl.......s.O......b1;9J.!~...i..mZK6.?}.!>......{=&9.

Seems that there is another .gz archive within .gz archive, but named .txt . If file extension is changed into .gz manually, for all archives unpacked from archives and named .txt, then it can be unpacked.
So seems like it is doing packing it twice using gzip, once makin .txt extension file and then into .gz extension file.
Should pack it only once for all archives again, to get ony once-packed .gz files (.txt.gz)