For Installing Warhammer 40,0000 Fire Warrior in Crossover 24, do the following:
1) So far the GOG.com version of the game works, the game DVD, does not, although testing may find how to install the game later.
2) The GOG.com Bottle Should be Installed as a Windows 10, 64-bit bottle.
3) When you open the game, you will be directed to the Launcher. From the launcher, you can view the key mappings for the game, along with choose either a multiplayer game (Hosted by Gamespy) or the Single Player Game. This is where you can find the key mappings. Or take the tutorial.