Call of Duty 7: Script Syntax Highlighting
You can purchase and download UltraEdit from IDM Computer Solutions,Inc.
In UltraEdit, under Advanced > Configuration...
Navigate to Editor Display > Syntax Highlighting. Select the [...] button to locate the worldlist.txt in your game bin folder. Click Apply.
To change your color selections, make sure Language is CODSCRIPT before you start changing colors.
The next time you have a .GSC open, highlighting will automatically take effect.