: A mission where players infiltrate a secret German research facility in the Austrian mountains to destroy technology or recover UFO blueprints.

Because this is part 12 of a multi-part RAR file, it is not a standalone piece of content. To use it, you generally need all preceding and succeeding parts (part1, part2, etc.) in the same folder to extract the full game data. Overview of "Shadow War" DLC Content

If you are looking for information on what this specific DLC package adds to the game, it includes: :

: You must have WinRAR or 7-Zip installed. Right-click on part01 (not part 12) and select "Extract Here." The software will automatically pull data from part 12 during the process.