Fields of Mistria mods and MOMI setup

A cautious installation checklist

1. Back up first. Keep a copy of important saves and any original files you would need to restore. A backup is a precaution, not proof that a mod is compatible.
2. Read the mod page. Confirm its supported game version, MOMI dependency, minimum installer version and any other requirements. MOMI’s documentation says each mod must be updated for its format; compatibility is not automatic.
3. Download from the author. Get the current MOMI package and each mod from its author page. Avoid reuploads whose contents and version cannot be checked.
4. Extract the mod correctly. The author’s docs say MOMI cannot install a mod left as a .zip. The mod folder should sit directly in the mods folder and contain its manifest.json, rather than being wrapped in an extra folder.
5. Install one mod at a time. Launch the game between additions. That is our troubleshooting recommendation: it narrows the likely cause if the game stops launching or content does not appear.

Windows location

Create mods inside the game directory, next to data.win. If MOMI cannot detect the game, the documentation suggests placing the installer in that same directory beside data.win. Do not move or rename unrelated game files to make a mod work; recheck the mod’s instructions instead. The exact directory can vary with where Steam is installed, so this guide does not invent a universal drive path.

Steam Deck and Linux locations

Steam Deck and Linux have two practical locations: a mods folder inside the game directory, or mistria-mods in your home directory. Use the current Linux package and confirm that every mod supports the same installer and game version. A folder being detected does not mean the mod itself is compatible.

After a Fields of Mistria update

Run MOMI again after the game updates. Before reinstalling a full set, check the installer and every mod page for new versions or dependencies. If the game no longer launches, uninstall all mods in MOMI, verify the game files from Steam’s Installed Files screen, launch the unmodded game once, and then reinstall compatible mods one at a time.

For vanilla lookup while mods are disabled, use the crop and forageable guide, the museum tracker, or the romance guide. The site data status describes the game snapshot used by this fan site; it does not certify mod compatibility.

Antivirus messages and safety limits

Some tool authors may describe a security alert as a false positive. That is only the author’s explanation, not proof that a file is safe. Do not disable security software merely because a page says so. Verify that the download came from the expected author page, compare the listed version and requirements, and stop if the source or behavior is unclear. This guide cannot audit executable files or guarantee any third-party download.