.S4M File Extension
File TypeSWAT 4 Map File
What is an S4M file?
Game file used by SWAT 4, a first-person shooter (FPS) game developed by Irrational Games and published by Sierra Entertainment in 2005; saves buildings, terrain, items, NPCs, and other map features; used for single or multi-player gameplay.
NOTE: SWAT 4 uses the Unreal Engine.