We have yet to test Xenonauts on a wide range of systems, although we will do so during beta testing. Initial testing suggests that anything with over 128mb of video memory and more than 1gb of disk space will be able to run the game. A widescreen monitor is also hugely beneficial as the GUI screens are designed with the extra screen space in mind, and it allows us to have a lot more information on the screen at once. 4:3 aspect ratio monitors will still work, but things can get a bit cramped.
This page will be updated when there is further information available. We will refund any pre-order where you cannot play the builds due to technical reasons.