OGL .Net problems

Well, i installed .net on my pc, and I''m trying to port the engine I have on Dev c++ to Visual C++ 7(.Net). Now, I made a new Win32 project, a blank project btw, and then added all the files I had into the project. Once I did that, and fixed some errors, I received, when compiling, 517 lines of errors. all of them come from the gl\gl.h header which i just figured doesn''t recognize WINGDIAPI, basically a macro inside this header. I go like "wtf!", so I decided to put, before every include of the gl header, #include <windows.h> ... this solved the hundreds of error problems, but: 1) Isnt there any way I could just include gl/gl.h without having to put windows.h EVERYTIME? shouldn''t the header precompile only once? 2) Im still having some errors: c:\Program Files\Microsoft Visual Studio .NET\Vc7\PlatformSDK\Include\WinDef.h(143): warning C4114: same type qualifier used more than once c:\Program Files\Microsoft Visual Studio .NET\Vc7\PlatformSDK\Include\WinDef.h(143): error C2632: ''char'' followed by ''char'' is illegal c:\Program Files\Microsoft Visual Studio .NET\Vc7\PlatformSDK\Include\WinDef.h(143): warning C4091: ''typedef '' : ignored on left of ''unsigned char'' when no variable is declared If anyone can help me, I''d really apreciate it.