the map that was listed in the op is a mapversion 1 from the days of sins vanilla 1.01 to 1.09.
if you place the galaxy file in the galaxyforge folder and then run the latest version of my map updater which is in my modding utility pack(as is all of my sins utilities) in the mod updater thread at the BOTTOM of the OP.
or if you only want the map updater without ANY of my other utilities then the map updater thread is the place to download the v2.01 from ( and just delete the targetsinsver.txt from the folder where you extracted the map updater AND all its files to).
the reason you do not see the map when it is the correct location is that the sins engine checks the map version to PREVENT minidumps due to the changes in map format, which if you remember the entrenchment beta will bring back horrible memories of your custom maps CAUSING minidumps when attempting to play a game
and the changes from version 1 to version 3 ARE MAJOR, like each planet having extra entries and a couple of extra lines in the initial heading area.
just for your info I did just download the map, placeed it in my galaxyforge folder and ran my latest map updater, found all the galaxy files, updated them (in place with the old files being renamed to galold(done automatically by the program)) and them started a game on the map in diplomacy 1.011 without problems
if you want the map updated to mapversion 3 I have just uploaded it to http://www.filefront.com/16993991/Boaz%20mv3.zip