Hey there,
Here is this from my Linux support:
"I think you might need a start script if you want to be able to launch the game from a file manager, but I didn't think that was important to most Linux users.
If you do need one, something simple like
#!/bin/sh
./nw
put into a file dujanah.sh should be enough, and then both "nw" and "dujanah.sh" would need to be made executable."
Hope that helps,
Jack