You think what DoomEro is only one guy who rip out doom 3 weapons, You Are Wrong. AlphaEnt, developed this mod long ago and it is better wan doomero's rip sounds stripes even models (models and maintenance by Vavency).
In Laymans terms: You need this file from this point to play this mod. All weapon stripes, sounds and texture definitions are stored in this file, by it self it's useless but whit code files it becomes in to properly working mod. In Laymans terms: You need this file from this point to play this mod.