Call of Duty 4: Modern Warfare

[Daz]

Wikipedia actually explains it reasonably well:

http://en.wikipedia.org/wiki/Games_for_windows

Games which wish to be included in the Games for Windows platform must meet certain requirements regulated by Microsoft. These include,[3] but are not limited to:

* An "Easy Install" option that installs the title on your PC in the fewest possible steps and mouse clicks
* Compatibility with the Windows Vista Games Explorer (see below)
* Compatibility with the Xbox 360 controller (where applicable)
* Installs and runs properly on x64 versions of Windows Vista and is compatible with 64-bit processors (though the game itself can be 32-bit)
* Supports normal and widescreen resolutions, such as 4:3 aspect ratio (800 x 600, 1024 x 768), 16:9 aspect ratio (1280 x 720), and 16:10 aspect ratio (1152 x 720, 1280 x 800)
* Launching from Media Center (Windows Vista Home Premium and Windows Vista Ultimate have Media Center)

And: http://en.wikipedia.org/wiki/Games_for_Windows_-_Live