Stupid

Okay, I'm not complaining about my TV or anything, but when the specs say it has a max resolution of 13xx by 768, it suggests a widescreen aspect ratio. So why, I ask, when you hook a computer up to it, it only supports 4:3 aspect ratios? This stretches my desktop and warps pictures and stuff. I can set the TV to display 4:3 but that wastes a lot of space on the sides. The computer displays quite nicely - clear and bright - on the TV so to use it as a monitor is perfectly acceptable (I wonder how games would look...) but I'd like to take advantage of the widescreen.