Noticed a few people on forums ran into the problem of launcher only supporting upto 1200p.
This is a workaround for that issue. :)

I would recommend doing this after you load the game at least once and set other graphics options to personal preference.

Browse to C:\Users\XXXX\AppData\Roaming\Milestone\MX2013
Find the Config.ini and open with notepad or another editor.
Change the Height and Width options. eg, Width=2560 Height=1440 for 1440p.
Change any other settings you might like, eg force a higher refresh rate.
Make sure to set file to read-only and load the game.
It will give you error messages about being unable to write to the config.ini file. Ignore them by pressing ok several times and enjoy glorious high res pc gaming as it should be.

The above goes for a lot of milestone games, if you have installed others in the past they will be in the same "milestone" folder and you should be able to edit the ini files the same way.

Notes:
Windows hides these AppData folders by default so you might not see them.
http://blogs.msdn.com/b/zxue/archive/2012/03/08/win8-howto-19-show-hidden-files-folders-and-drives.aspx
Can also try Run -> %appdata% if all else fails.

Cheers folks.