After the successful installation of Hidden & Dangerous 2, I can't run the game.
Message: Wrong cd key, contact Illusion Softworks.
Please go to Start > Run > type "regedit" and launch the Registry Editor. Then you need to navigate (using the left menu) to: HKEYLOCALMACHINE\SOFTWARE\Illusion Softworks\Hidden & Dangerous 2. Locate the key string and paste your CD key then launch the game.
How to find the CD-key with linux-ubunutu OS