Where Are Killing Floor 3 Save Files Located?
Killing Floor 3 saves sit in a Nightfall folder in AppData, named for the in-game rebel group rather than the game.
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Killing Floor 3 names its save folder Nightfall, after the rebel group you fight for in the campaign. Anyone searching AppData for KillingFloor comes up empty, since Tripwire used the faction name instead of the title.
The game runs on Unreal Engine 5, so the familiar Saved/SaveGames and Saved/Config split applies underneath. Loadouts, specialists and settings all live under that one Nightfall tree, and Steam Cloud syncs it between machines.
Where Killing Floor 3 stores this, by platform
C:\Users\[Username]\AppData\Local\Nightfall\Saved\SaveGames
Progress lives here while graphics and keybinds sit in Saved/Config/WindowsClient beside it. Copy both folders for a complete backup.
~/.steam/steam/steamapps/compatdata/1430190/pfx/drive_c/users/steamuser/AppData/Local/Nightfall/Saved/SaveGames
Proton prefix for Steam Deck and Linux desktops, app ID 1430190. Same Nightfall folder name inside the prefix.
Frequently asked questions
What is the Nightfall folder in AppData?
It is Killing Floor 3. Nightfall is the rebel faction in the story, and Tripwire named the save directory after it instead of the game title.
Does Killing Floor 3 support Steam Cloud?
Yes, on both Steam and Epic builds. If progress looks missing on a second PC, let the sync finish first, since the local Nightfall folder only fills once it does.
Notice an outdated path? Let us know.