From GameStudio Wiki
Gamestudio uses several proprietary file formats.
There are five Gamestudio-specific 3D file formats:
- WMP for a level
- WAD for level textures
- WMB for a compiled level with BSP tree and lightmaps
- MDL for animated models
- HMP for terrain
Other proprietary file formats are:
- $$M for communication between WED and the map compiler