There is only one file type that uses the .LUXB extension:
Lux Map File
Map used by Lux, a computer game similar to the board game Risk; may be included with the game or created using the Lux Map Editor.
The Lux video game is available in several versions including Lux Delux, Ancient Empires Lux, and American History Lux.
Updated: August 15, 2007