Where Does Crusader Kings 3 Store Mods?
Crusader Kings 3 local mods live in Documents under Paradox Interactive with .mod descriptors, plus Steam Workshop mirrors. All three desktop paths.
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Crusader Kings 3 splits mods the Paradox way. Local mods live as folders with .mod descriptor files in the mod directory under Documents. Workshop subscriptions mirror into the Steam content tree for app 1158310, and the launcher playset decides which set actually loads.
The saves post covers campaigns. This one covers the mod side. Descriptor version fields decide compatibility at load, so a major patch disables half your list until authors catch up. Total conversions deserve their own playset, since they touch everything and conflict with nearly all else.
Where Crusader Kings 3 stores this, by platform
%USERPROFILE%\Documents\Paradox Interactive\Crusader Kings III\mod
Local mods with .mod descriptors, plus ugc and launcher playset data beside them. Workshop mirrors live in <SteamLibrary>\steamapps\workshop\content\1158310. Saves sit in the sibling save games folder.
~/Documents/Paradox Interactive/Crusader Kings III/mod
Same Documents relative layout on Mac. The launcher shares descriptors across installs, so one playset per campaign avoids cross contamination.
~/.local/share/Paradox Interactive/Crusader Kings III/mod
Identical mod layout on Linux. Native and Proton installs share descriptors while Workshop mirrors stay per library.
Frequently asked questions
How do I install Crusader Kings 3 mods?
Subscribe on Workshop and tick the set in the launcher playset. Files land in the workshop content tree for app 1158310 with descriptors mirrored below. Keep one playset per campaign since patches break old mods.
How do I back up a modded campaign?
Copy the mod folder plus the save folder from the saves post with the launcher closed. Descriptors travel as .mod files while subscriptions re-download from Workshop. Dropping a gameplay mod mid campaign corrupts the timeline.
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