Not a joke, it does work! Tested on WinXP Pro SP2, 1Gb RAM, 2.2Ghz CPU and X850XT GPU!
http://d.turboupload.com/d/1892930/H...NoGrp.rar.html
Follow the instructions, but also copy the 'wow.dll' file into your Halo 2 folder as well, the instructions forget to tell you that! Make a backup of 'mf.dll' as this will be overwritten and probably won't let it run under Vista, so make a copy so you can put it back!