-Baldur's Gate 2

-Betrayal at Krondor

-Half-Life

-Mount & Blade

-Civilization series

-Heroes of Might & Magic series (sixth inbound!!!)

-Lands of Lore series

-Starcraft I and II

-Diablo series

To avoid the confusion brought by the people that made the "console-exclusive" rule, I'm gonna list my favorite games that are only (or were timed) on the Windows platform...

Doom & Doom 2

Quake & Quake 3

Command & Conquer / C&C: Red Alert

Age of Empires series

 Half Life & Half Life 2 (it was PC-only until the MAC and Xbox ports)

Starcraft

Warcraft series (except WoW)

Daikatana... Just kidding

1. Wolfenstein: Enemy Territory
2. Civilization IV
3. Emperor: Rise of the Middle Kingdom
4. Rome: Total War
5. Titan Quest ( Immortal Throne expansion)

I was about to mention Deus Ex but then I realized it's not exactly 'exclusive'. Also, the only reason Baldur's Gate II is missing, is that I'm still working on the first game. I'm sure it'll reach a top position on my top 5 list.

Deus Ex first released as a Windows PC game, and later was ported to MAC and PS2, Civ IV, Rome and Wolfenstein have the same issue, first for PC, then for MAC... I count those as timed, they sold the most on Windows PC and most people know them on PC (unlike Portal or Bioshock, they're known well on both consoles and PC)...

In this regard, Windows and Mac are the same thing to me. It's the PS2 version that's the issue. If someone clearly stated the rules in the beginning, I would have included it on the list but I don't feel like editing it anymore.

That's cool, for me, MAC OS and Windows OS are different platforms because the development process is different for the games to play natively, but one can argue that both are PCs... That's the thing about not setting clear rules about the exclusivity and the timed exclusivity, for example, i always laughed at the term "console exclusive", because it clearly means that it's only on consoles, but people use it to say that a game is available on one console and a PC.