: A hardback art book featuring concept art and designs from the game.

: Some online communities share compressed "repacks" of the game that include all Professional Edition DLCs in a single installer. System Requirements

: If the .zip file is small (around 12 MB), it is likely a set of replacement DLLs or configuration files used to fix the game not launching or starting on modern versions of Windows.

: In-game access to advanced silenced weapons like the Jagd P22G, HX UMP, and SPS 12.