Is this a steam code or otherwise compatible with the steam version of XCOM?

I bought this retail version and it has a steam code in a small booklet inside. It works with with my steam version of XCOM Enemy Unknown which is required to play Enemy Within. Steam treats this expansion as an add-on or dlc, therefore Enemy Within won't show up in the steam game library list.

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XCOM: Enemy Within - (Requires Enemy Unknown)

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2K Games
M - Mature
Genre Strategy

Please note that this product is non-returnable and non-refundable.

Overview

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XCOM: Enemy Within is the expansion to the 2012 Game of the Year strategy game XCOM: Enemy Unknown. Enemy Within adds an incredible array of new abilities, upgrades, and weapons to combat new enemy and alien threats. This expansion pack also introduces new maps, new tactical and strategic gameplay, and new multiplayer content to provide a fresh new gameplay experience.

NOTE: Requires XCOM: Enemy Unknown to play

New Soldier AbilitiesResearch new alien technology to advance the capabilities of your operatives.
New Weapons and EquipmentGive your operatives an extra tactical edge with new projects from your engineering team and the Foundry.
New Enemy ThreatsAdopt new tactics to counter the threats from two new alien classes, including the Mechtoid.
New Strategic ResourceA valuable new alien resource, known as MELD, has been released onto the landscape providing access to new research and upgrades.
New Tactical Challenges and MapsNew tactical challenges are introduced across an additional 47 maps.
New Multiplayer maps, units, and abilitiesCreate your custom squad from a wider array of options, and dominate your opponent in intense, one-on-one, turn-based matches.

Model
Brand	2K Games
Model	710425412868

Details
Name	XCOM: Enemy Within
ESRB Rating	M - Mature
Genre	Strategy

Features
Features	XCOM: Enemy Within is the expansion to the 2012 Game of the Year award-winning strategy game XCOM: Enemy Unknown. Enemy Within adds an incredible array of new abilities, upgrades and weapons to combat new enemy and alien threats. This expansion pack also introduces new maps, new tactical and strategic gameplay, and new multiplayer content providing a fresh new gameplay experience. *REQUIRES XCOM: ENEMY UNKNOWN TO PLAY New Soldier Abilities: Research a new alien technology to advance the capabilities of your operatives. New Weapons and Equipment: Give your operatives an extra tactical edge with new projects from your engineering team and the Foundry. New Enemy Threats: Adopt new tactics to counter the threats from two new alien classes including the Mechtoid. New Strategic Resource: A valuable new alien resource, known as MELD, has been released onto the landscape providing access to new research and upgrades. New Tactical Challenges and Maps: New tactical challenges are introduced across an additional 47 maps. New Multiplayer maps, units, and abilities: Create your custom squad from a wider array of options and dominate your opponent in intense, one-on-one, turn-based matches.

Additional Information
First Listed on Newegg	September 10, 2013

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Limited Warranty period (parts): 1 year
Limited Warranty period (labor): 1 year
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XCOM: Enemy Within - (Requires Enemy Unknown)

Learn more about the XCOM: Enemy Within

Customer Reviews of the 2K GAMES 710425412868

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Item#: N82E16832205118

XCOM: Enemy Within - (Requires Enemy Unknown)

Learn more about the XCOM: Enemy Within

Customer Reviews of the 2K GAMES 710425412868

Warranty & Returns

Warranty, Returns, And Additional Information

Warranty

Return Policies

Manufacturer Contact Info