Doesn't matter what OS the author was using when he created the map, the map should have no problems running on other OS's/machines/even versions of AC. Maps from 1.0.4 should be compatible with 1.1, nothing that drastic has changed in the map format. Some things should be updated of course, like adding plclips, helmet pickups, etc.
All you will need is the map .cgz (and if it has one) the .cfg
Edit: Yes, yes it is possible. :P
All you will need is the map .cgz (and if it has one) the .cfg
Edit: Yes, yes it is possible. :P