Well, why should it? To my knowledge, the last time it was advised to install a 32 bit Windows was three years ago. And every computer manufactured today is 64 bit. Partly because these also support CPU based execution security.wont open in 32bit (x86).
Take a look at any game that is available on the market today. There are infinitely few that support 32 bit, and if you look at statistics, virtually nobody use it. I mean, last I checked we were talking about 5% of Windows users in total.
32 bit is only offered for backwards compatibility, that is, for those who need to run fx old economic systems and specific server software which hasn't been updated.