Since I cannot browse the live web to read a specific blog post you might be referring to, I have drafted a technical blog post explaining what this file is, its significance in the modding community, and how it functions.
Because fcom.esm relied on specific versions of the parent mods, if you had the wrong version of OOO, fcom.esm would look for a FormID that didn't exist, resulting in an Instant CTD (Crash to Desktop) upon loading. fcom.esm
is a primary master file associated with FCOM - Fallout Commander , a popular gameplay overhaul mod for Fallout 4 . It serves as the architectural foundation that allows players to summon, organize, and command tactical squads from the game’s major factions. Overview of FCOM - Fallout Commander Since I cannot browse the live web to