Wow Widescreen 16:10?

Quick question today after some reading of various things about games and ws support etc.

I know wow has native ws support (ie resolution) but does it extend the horizontal view (the whole point of ws) or is it just a 4;3 enlarged. Didnt have time to investigate last night, but from some looking it seems not many games do proper +horz views without some fiddling or a hotfix.