Maybe with Xbox one having a pc like architecture makes porting easier.

Since the OG Xbox MS has not cared one bit for PC gaming and more recently with the creation of the abomination that is GFWL they have been trying to effectively kill it and funnel everyone to Xbox Live. Good thing that monster has been slain.
This is why, as a PC gamer I'd much rather buy a PS4 and a WiiU for the Japanese exclusives and play everything else on PC, including all those timed Xbox exclusives.

MS will only care about PC gaming if they can make money off of every game being sold, or forcing gamers to pay for online play. (like the XBox) They tried to make more money with GFWL, but that was a disaster.

They keep saying how much they care about PC gaming, but continue add nothing of value. The best thing for PC gaming is for MS to continue to ignore it. Let companies like NVidia, AMD, Valve, Blizzard, Oculus Rift drive innovation in PC gaming.

Games for Windows Live! Was only the start.
With Windows 8.0 and 8.1 they tried to make the marketplace in metro the primary place to buy games/software/everything.

Thankfully, it hasn't worked as intended due to various reasons and they seem to be wanting to just support Steam instead of their own stores now. - Still waiting for them to re-release Gears of war on steam though.

I'm interested to see the direction they go with Windows 10 and it's store front, but in my opinion they really do need to partner up with Valve to make some headway.

With that said, Microsoft has done *some* good in the PC space, they consolidated the API market and set standards with Direct X.
If anyone remembers during the early Direct X era, there were half a dozen different API's on the market, some API's would only work on specific hardware and had games exclusive to it. (I look at you Glide.)
It was even worse before Windows 95 came along.

With that in mind, once the Xbox 360 launched, Direct X stagnated with Direct X 9, Windows XP didn't help matters either, being on the market for so long.

The influence that Microsoft's Direct X (Which also has input from all the major PC players such as AMD, nVidia and Intel to help ratify standards) has had far reaching consequences, be it tablets, phones, consoles which use hardware designed and built to be compliant with Direct X's feature set, otherwise 3D accelleration as we know today may have been vastly different.

Then why the fuck do their games keep getting PC ports. That's been bothering me for a while...

Well, those aren't their games. They published them, but they don't own them. They probably just didn't explicitly forbid later PC ports in the contracts. As a result, Crytek and Capcom saw it as a way to make some extra money off of their games.

PC gamers and console gamers aren't exactly the same audience.

The games that get ported are probably by request of the developer. If MS allows them to make a PC port, that's an incentive to work exclusively with MS.