Windows 10 requires the DXGL or else it will drop into a strange corrupt video mode that only takes up 1/3 of the left side of the screen, this happened on every modern machine I've tried. It has something to do with directdraw being relatively nonexistent in Win10

It's basically the Windows 7/8 patch + WC3.MNU + DXGL and the DXGL is what makes the whole thing boot up.

I'd imagine a team of classically trained coders could write a directdraw wrapper specifically for WC3 but DXGL seems promising in its own right.