Where Are Killer Instinct Save Files Located?
Killer Instinct splits by store: Steam userdata for the Steam build and an Xbox package folder for the Microsoft Store build.
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Killer Instinct ships on two PC stores with nothing shared between them. The Steam build uses the standard userdata tree under its app ID. The Microsoft Store build uses the Xbox package layout with settings and saves in separate subfolders.
Xbox Play Anywhere ties the Store copy to consoles through Xbox Cloud, which is the real transfer path. File copies only work within the same store. Check which edition you own first, then open the matching tree.
Where Killer Instinct stores this, by platform
<SteamFolder>\userdata\<user-id>\577940
Progress and fighters for the Steam build. The user ID segment varies per account, so open userdata and pick the ID you see.
%LOCALAPPDATA%\Packages\Microsoft.KillerInstinct-Win10_8wekyb3d8bbwe\SystemAppData\wgs
Microsoft Store and Game Pass copies. Packaged builds write saves into SystemAppData instead of userdata.
%LOCALAPPDATA%\Packages\Microsoft.KillerInstinct-Win10_8wekyb3d8bbwe\Settings
Settings for the Store build. Separate from saves, so back up both subfolders for a complete move.
<SteamLibrary>/steamapps/compatdata/577940/pfx/
Steam Play prefix, app ID 577940. The userdata tree is mirrored inside it.
Frequently asked questions
Can I copy a Steam save into the Store version?
No. The Steam build lives in Steam userdata while the Store build lives in its Xbox package folder. Copying between them does not transfer progress. Xbox Cloud syncs the Store side across Xbox and PC instead.
Does Killer Instinct back up saves to the cloud?
Steam Cloud covers the Steam copy and Xbox Cloud covers the Store copy, including Xbox consoles. Manual copies still help before reinstalls, since cloud restores lag the live files.
Where are Killer Instinct saves on Steam Deck or Linux?
Use the Proton prefix with app ID 577940. The userdata tree is mirrored inside it.
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