TSD files are associated with game engine developed by NovaLogic studio. TSD files store surface tiles used by the engine for rendering the game environments.

TSD files were used in multiple NovaLogic games, such as the Comanche, Delta Force, or F-22 Lightning series. Voxel Space Engine is the name of the engine that uses TSD file format. This engine is no longer used by developers as it is considered obsolete (it was developed in the late 2000s).