Visual C++ Resource Management

Grrrrrrrrrr @ Visual Studio

I have created a menu resource (go me :D) and created a menu called &File. I create an item on the file called &Open (I'm assuming this might be a common thing people want to do). That automatically assigns the ResourceID of ID_FILE_OPEN. Lovely. It's already defined, along with all the other stuff, when I check the Resource Symbols. So I go to build my project and it claims "error C2065: 'ID_FILE_OPEN' : undeclared identifier". Gah. Is there a specific header I should be referencing? MSDN isn't giving me anything useful.

At the moment I have windows.h referenced, and the file resource.h which was generated by VC++ and contains the ID of my menu, but not the subthingies.

Should I change the identifier so it doesn't clash with the read-only ones?

And another question - how should I structure my message loop? I'm assuming that tying the file opening code into the loop is bad, and when it sees a ID_FILE_OPEN message (or whatever it ends up being) that it should call some other code. If these functions go in another .cpp (would that be a bad plan?) do i put '#include "myotherfile.cpp"' in the code? Or is that just for header files?

Thanks

Chris

VC++ should generate a resource.h file that you must include.