.XAN File Extension
What is a XAN file?
A XAN file is a game map used by some Worms series games, including Worms 3D and Worms Mayhem. It contains a map's three-dimensional geometry and features, such as terrain, buildings, and water.
Worms can style maps for day, evening, or night using custom shader (.csh) files that are installed in the same directory as the maps. For example, the map DEMO_Mission.xan has corresponding files, DEMO_MissionDAY.csh, DEMO_MissionEVENING.csh, and DEMO_MissionNIGHT.csh.