there is an original civ.exe downloadable at
http://apolyton.net/civ1/civ1patches.shtml
it's posted as
Civ Patch (DOS) v5.0 (136k)
http://apolyton.net/civ1/files/updates/civv05.zip
should be the 'latest' civ.dos version ever and fix some bugs.
the version at abandonia is civ.exe v.1.0
(more exact: 474.01)