Windows XP/Vista support

[GVovkiv]

It might be worth checking hardware surveys, like the ones performed by Steam, to understand how many people still use older versions of Windows. Even Windows 7 only counts for some 2~3% of respodents. While it's nice to support older systems, there comes a point where it stops making economic or practical sense.

And, also, worth noting that steam doesn't support xp for a long time now, so making sure that game working on os where, for example, you can't sold game, is kinda pointless