Thanks to Joel who managed to install and run the game, some informations on Atlantis World:
Translating the help/manual files from German the app described itself like this: "Atlantis World is the implementation of the famous and popular BTX Dialog Systems Atlantis."
It's apparently a graphical front end for a community or game using the German BTX (Bildschirmtext) connectivity devices/software? I can't tell if the Atlantis BTX system is a specific game server or just an email / message boards / chat / etc. German early BBS type system. Given the graphics I see, I think it's the latter.
German 
Comments and reviews
these were graphics in a "frame" that sat on Top of BTX and was the very first attempt to bring a nice graphic to the BTX Chat System that was very text based.
The Problem was that is was running awfully slow on the platform DOS if i recall right and you had to be "online" with the BTX System (Teletext kind) and paid per Minute.
i feel it never was developed to work flawlessly and was not pursued by the company in Flensburg. 1990 BTX started to dwinde and the Internet came which allowed much more graphically desigend pages.
I used to work for ATLANTIS as a Chat Moderator - it was basically after EDEN one of the first big chat systems (per per Minute) in BTX
So basically you have to install this game manually like you would any other game where you have to unpack files them with the files provided with the archive. I don't have the time or desire to do that at this time but if anybody has the time or inclination to install it on their system let me know how it went.
This Atlantis was a pure online chat system in BTX times, in German.
You could register a username and then join the chat. There were various public and private chat rooms. It was also possible to send private messages to a user. If I remember correctly, there were also features that were available for a fee. These costs were then paid with the telephone bill.
The images shown were background images for the chat system.
Boxer states the download contains no DOS files. I can not make the game work using Boxer, any hints out there? It looks like a good game, but I have to give it a one star because it does not work. It states above: "Thanks to Joel who managed to install and run the game?" It would be nice if he included how he got it to run.
Who said Bioshock and Rapture ?
No comment nor review for this game at the moment.