I read and recently saw that certain Win16 obsolete functions are still supported by newer Windows versions and that they even have 64-bit long mode. I know that they aren't encouraged to use but I'm very curious to do so. Imagine someone reverse-engineering your 64-bit modern executable, compiled with latest Visual Studio and saw function instances like 'WinExec', '_lopen'. This will be very cool!

If this isn't a reason I'm also very thirsty for knowledge about them.

But in the msdn library functions like '_lopen' aren't present althought that I have saw them in 'kernel32.dll' exports.

So my questions is where I can find Win3.x SDK or documentation (I was able to download some DDK but I don't think that this it). Please if somoene have something like this archieved - I'll very appreciate if he/she share it with me.