This article will explain the special rules required when registering .wien domain names through 123-reg.
The .wien domain extension is the new Top Level Domain extension for people or companies associated with the Austrian capital of Vienna, or Wien.
There are no limitations or regulations on registering a .wien domain name, other than a requirement that you are associated with Vienna. The registry states that a .wien domain name can be purchased as long as you can prove "an economic, cultural, historical, tourist or social connection to the Austrian capital Vienna by any legal or natural person."
While your association with Vienna will not be checked during the sign up process, the registry (http://www.nic.wien/) reserves the right hold random spot checks to verify that the owner of the domain is associated with Vienna.