Maybe it's time to get used to the normal picture?
Really totally unplayable is ugly melting picture 4:3 to 16:9...
There are two[or three..] solutions:
1. hardware settings in your display, like turn off "keep aspect ratio", select kinda "stretch to screen"
2. driver level fix by nvidia/amd/intel apps: find settings and do something similar
if normal solutions somewhat not working:
3. use Warcraft II Config.exe, turn off "keep aspect ratio", then
for GDI ddraw - switch to windowed mode, and stretch window as you wish
for CNC ddraw - select OpenGL in config + No border (fake-windowed mode)