Call of Duty: Modern Warfare 2 - Stimulus Package

The Modern Warfare 2 Stimulus Package delivers additional action-packed multiplayer maps, including brand-new battlegrounds and legendary fan-favorites from Call of Duty 4: Modern Warfare.

When purchased, this content will be automatically downloaded and incorporated into the game; DLC will not be listed as a separate entry in your Steam Library.

To view the additional content, please do the following:

1) Log in to Steam

2) Navigate to your Library list

3) Right-click on the game

4) Select "View downloadable content".

Source: Steam