How to define preprocessor directives in VC++ 2008?

Question

I'm using Visual C++ 2008 Express Edition. The WIN32 preprocessor directive doesn't appear to be defined by default, so when I surround includes with #ifndef WIN32, it still includes them.

I found someone with the exact same problem below, but it was so long ago that the location of this setting has changed:

http://www.gamedev.net/community/forums/topic.asp?topic_id=418604

Answer 1

In VS 2008 Pro, you right-click on the project and select Properties. Then look for Preprocessor Definitions in Configuration Properties | C/C++ | Preprocessor.

Answer 2

Try _WIN32 instead (notice the underscore...)

From MSDN.