CD keys for AI War: Ancient Shadows do not register on Steam. However, if you've bought from our store and would like a Steam key, just send us an email at arcengames (at) gmail (dot) com with either your proof of purchase or the email address that you used in order to make the order, and we'll send you a Steam key back.
Sorry for this taking so long, but there were numerous challenges with this, as was discussed in prior threads. But I had the opportunity to resolve this today while also discussing something related with Valve, and so took it.
Cheers!