In the modding ecosystem, an .esm (Elder Scrolls Master) file contains the core data and references used by the mod.

: The mod is available for download on Nexus Mods and Bethesda.net for both PC and Xbox One. It is not available for PS4 due to Sony's restrictions on external assets.

The primary job of fcom.esm was to inject items and creatures from one mod into the lists of another.

In the Bethesda modding engine, an file (Elder Scrolls Master) acts as a master dictionary. It defines the core rules and IDs that other plugins (.esp) rely on.

: Through the radio or direct dialogue, you can order squads to regroup, hold positions, set up perimeters, or seek and destroy enemies.