Compile In Windows
Compiling FreeOrion with Microsoft Visual Studio
If you want to compile in Windows, for now you can read the documentation that Ted Bullock has been writing which details how to build FreeOrion and all its prerequisites entirely from source code. For now his document is incomplete but is available on his personal webserver.
Eventually the instructions he describes in that document will be moved to this page so that they can be maintained by the community more easily.