XNA 4.0 + DirectX 9?

Question

I use XNA 4.0 and Visual Studio 2010 , and when I create an XNA project and publish it, it does not work on a computer with DirectX 9.0c (without DX10 / 11).

As I understand it, the project is set to DX10 by default.

Is there a way to make the project compatible with DX9?
How can I create a new project compatible with DX9 from the very beginning?

Answer 1

You need to change the game profile from Hi-Def to Reach in the project properties.

http://blogs.msdn.com/b/shawnhar/archive/2010/03/12/reach-vs-hidef.aspx