How to programmatically tell the difference between XP 64 bit and Server 2003 64 Bit

Question

I have a program where I need to display a different link to a different download based on what version of windows a user is running.

Using this answer I am able to

Answer 1

GetVersionEx will set wProductType to VER_NT_SERVER for Windows Server 2003/2008/2008R2/2012, versus VER_NT_WORKSTATION for Windows XP/7/8.

You already know how to get whether the OS is 32-bit or 64-bit, so with a bit of P/Invoke (GetVersionEx is here), you should be able to figure out the rest.

Alternatively, if you don't want to use P/Invoke, you could use WMI, and take a look at the Win32_OperatingSystem class, which has the same information in the ProductType property. I wouldn't bother doing it this way unless you really had to.