Setup.exe

是引导程序，它自动判断系统是否安装了.Net，如果安装了会自动判断.Net的版本。

如果安装.Net 4.0以上，则调用程序Setup4.exe

如果安装.Net 2.0以上，则调用程序Setup2.exe

如果没有安装.Net则调用.Net2.0安装程序。-Setup.exe

Is the boot program, it automatically determines whether the system is installed. Net, if installed will automatically determine. Net version.

If you install .Net 4.0 or later, call the program Setup4.exe

If you install .Net 2.0 or later, call the program Setup2.exe

If you do not install .Net is called. Net2.0 installer.