Multiplayer games for PC/Windows with 2-player online support

ArmA II

Players: 0 local, 4 online

Line of Sight: Vietnam

Players: 0 local, 2 online

Close Combat: First to Fight

Players: 0 local, 4 online

Supreme Commander

Players: 0 local, 3 online

Company of Heroes: Tales of Valor

Players: 0 local, 4 online

Muffin Knight

Players: 0 local, 2 online

Contagion

Players: 2 local, 8 online

Sniper Elite 4

Players: 0 local, 4 online

Killing Floor

Players: 0 local, 6 online

Damnation

Players: 0 local, 2 online

Splinter Cell Conviction

Players: 0 local, 2 online

The Incredible Adventures of Van Helsing

Players: 0 local, 4 online

Operation Flashpoint: Red River

Players: 0 local, 4 online

Full Spectrum Warrior

Players: 0 local, 2 online

No One Lives Forever: Spy in HARM's Way

Players: 0 local, 4 online

GREED: Black Border

Players: 0 local, 3 online

Nom Nom Galaxy

Players: 2 local, 4 online

Tidalis

Players: 2 local, 4 online

Monaco: What's Yours is Mine

Players: 4 local, 4 online

Wyv and Keep: The Temple of the Lost Idol

Players: 2 local, 2 online

Unrailed!

Players: 4 local, 4 online

PULSAR: Lost Colony

Players: 0 local, 5 online

Dragon Ball Xenoverse

Players: 0 local, 3 online

Card Hunter

Players: 0 local, 3 online

First Feudal

Players: 0 local, 6 online