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When I tried to launch duskworld from the in icon in the bottom right in the main game menu, it launched firefox with "duskworld.exe" as the website.

After some "strace"-ing I found that the game is looking for a file named Duskworld.exe, but the Duskworld executable in Linux is actually named Duskworld.x86_64
(After it didn't found the executable with that exact name I guess it tried to fallback to xdg-open, which weirdly opened firefox)

A simple workaround is to go to the "<INSTALL_DIR>/game" directory and create a symlink using the command
"ln -s DUSKWORLD.x86_64 Duskworld.exe"
Thanks for sharing the solution!