.STWM File Extension
What is an STWM file?
Game file used by SuperTux, a 2D jump and run side scrolling game similar to the classic Super Mario games; defines a world that includes multiple levels; provides an overhead view of the world, which allows the player to move through the world as he completes levels.
STWM files define the world as a 2D grid of integers and also include references to the level (.STL) files and their (x,y) locations on the grid.
NOTE: STWM files use plain text formatting and are located in the /data/levels/worldmaps/ directory of the game installation.