It prints "You are NOT running Windows XP" on x64 XP.

That is because it is actually based on Server 2003.

It can be used with dot42 - C# to Android compiler. Visual Studio Express can't.

Security. When you want to run untrusted modding code.

It's hard to sandbox python or lua and block I/O and all system calls. 1 mistake and player computers are compromised.

Even with JS in browser you can't just eval(), you need sandboxing like https://code.google.com/p/google-caja/ or https://github.com/jterrace/js.js/ (200 times slower than js).

How does it do networking?

All I see in docs is a simple GET/POST request. Realtime multiplayer game would be very slow using it.

Documentation is one of Haxe's weak points right now.

Various Haxe networking libraries: https://github.com/MattTuttle/hxnet https://github.com/andyli/hxudp

The FQA is silly and out of date.