I'm writing a 3D viewer using OpenGL, which uses a fullscreen window. I'm using the WS_POPUP style to get a window with no boarders or title bar. This works fine on my Win98SE system, but when I took the code to Win2k box (and recompiled it with the same version of my compiler, MSVC++ 6.0 - no service packs) the program would crash. CreateWindowEx failed outright (it didn't even give me a NULL return). Remove WS_POPUP from the style and everything works.
As such, are their any issues I need to be aware with WS_POPUP on Win2k? MSDN didn't list anything. I can also post the code later if it would help.