Grand Theft Auto IV
Grand Theft Auto IV (Also known as GTA IV) is an open world action-adventure game published by ęRockstar Games. It has had two DLCs so far, The Lost and Damned and The Ballad of Gay Tony.
This game was written primarily for consoles and the PC port is not of a high quality. However, for those who can get it running, there are many mods availible, some of which are spectacular.
Graphical settings
The GTA IV graphics settings work on the concept of a "memory budget". As you turn up the settings, you near your memory budget. If you wish to remove the restrictions on your memory budget, create a file called "commandline.txt" in your GTA IV folder and add "-nomemrestrict"
Tweaks
It is possible to run the game in windowed mode by right clicking the game in your Steam library, clicking on properties and then 'Set Launch options...' and adding:
-windowed