.UT4MOD File Extension

Module used by Unreal Tournament 2004 (UT2004), a multi-player first-person shooter game; extends UT2004 gameplay with new maps, characters, spawn points, weapon modifications, and graphics; may be loaded into UT2004 by double-clicking the module file.

UT2004 allows users to play in team-based or "every man for himself" modes in a variety of included or added module battlegrounds.