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A .modinfo file is the linchpin of any mod. At its core, a .modinfo file is just an XML file structured in a particular way and given the .modinfo file extension. It tells the game what files to load and what to do with them. It tells the game how a mod relates to other mods and to DLC. It stores all the basic info about the mod (such as the name, author, and so on)! For those coming from modding Civ VI, the structure of a .modinfo file should be very familiar to you, although there are a number of differences. If you’re ever in need of references, check out the various .modinfo files in the example mods, or in the game files (yes! The game’s modules and DLCs are structured in the same way as mods!).

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Sample .modinfo file

This is a sample .modinfo file. You can copy the code here to use as base for your own .modinfo files: 
<?xml version="1.0" encoding="utf-8"?>
<Mod id="fxs-new-policies" version="1"
    xmlns="ModInfo">
    <Properties>
        <Name>Antiquity Policies</Name>
        <Description>Adds new policies to the Antiquity Age</Description>
        <Authors>Firaxis</Authors>
        <AffectsSavedGames>1</AffectsSavedGames>
    </Properties>
    <Dependencies>
    </Dependencies>
    <References>
    </References>
    <ActionCriteria>
        <Criteria id="antiquity-age-current">
            <AgeInUse>AGE_ANTIQUITY</AgeInUse>
        </Criteria>
    </ActionCriteria>
    <ActionGroups>
        <ActionGroup id="antiquity-game" scope="game" criteria="antiquity-age-current">
            <Actions>
                <UpdateDatabase>
                    <Item>data/antiquity-traditions.xml</Item>
                </UpdateDatabase>
            </Actions>
        </ActionGroup>
    </ActionGroups>
 </Mod>
Continue to: .modinfo — Structure and elements