Skip to content

FOMOD Format

Patrice LECUYER edited this page Jul 30, 2026 · 1 revision

FOMOD Format

FOMOD (Fallout Mod) is the standard, XML-based format for guided mod installers used by the major mod managers. A FOMOD lives in a fomod/ sub-folder of the mod and is made of two files.

fomod/info.xml

Mod metadata: name, author, version, website, description, groups/categories. XIMOD builds this from the Mod Info tab.

fomod/ModuleConfig.xml

The installer configuration itself: installation steps, option groups, plugins, the files each plugin installs, condition flags, dependency patterns and conditional installs. XIMOD builds this from the Install Steps, Required Installs and Conditional Installs tabs.

XIMOD Architect implements the full ModuleConfig 5.0 feature set.

Encoding

Generated files are written in UTF-8. When reopening files created by other tools, XIMOD automatically detects the encoding (UTF-8 or UTF-16) so nothing is garbled.

Compatible mod managers

The generated files work with:

  • Mod Organizer 2
  • Vortex
  • Nexus Mod Manager (NMM)

Distribution

Mod managers expect the fomod/ folder at the root of the archive, alongside the mod's data. XIMOD's Export distribution archive produces a correctly laid-out .zip in one click (see Built-in Tools).

See also Selection and Plugin Types for the option semantics.

Clone this wiki locally