I installed this game again the other day, and found it very disappointing at 1280×1024 resolution on my new widescreen monitor. I did some research, and I was able to find a hack that allows you to play the game in the popular widescreen resolutions 1440×900 and 1680×1050. I am not sure it supports 1900×1200, but you could always try with this hack. Widescreen is achieved through a registry hack: HKEY_CURRENT_USER\Software\Blizzard Entertainment\Warcraft III\Video
Edit:
reswidth = xxxx (Make sure you change the default hex value to decimal value)
resheight = yyyy
Your cinematics will appear to be in previous low resolutions, but the gameplay will be in widescreen, but appear to be slightly stretched. Better than nothing for sure!
~Thanks again to Widescreengamingforum for this information
