This is the simple way that allows you to change Wc3 resolution on Mac OS X.
This is will allow you to run Warcraft 3 in wide resolution.
To change resolution you need to edit Wc3 file in Resource fork (it is like windows registy).
Before you start editing start Warcraft 3 for first time some it can write these setting in Resource fork.
First you need tool to edit setting in Resource fork, i recommend using ResFool.
Now navigate to
Edit ‘reswidth‘ and ‘resheight‘, save it and your done.