Where Are Assemble with Care Save Files Located?
Assemble with Care names saves per user ID in Steam userdata, with Mac saves in an app container.
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Assemble with Care saves progress in a JSON file named after your numeric Steam user ID, inside the userdata cloud folder. Mac builds keep saves in the app container instead.
The per-ID filename means shared PCs keep progress separated cleanly, one file per account. It also means copying saves between accounts is a rename away. Grab the file for backup; Steam Cloud mirrors it anyway.
Where Assemble with Care stores this, by platform
C:\Program Files (x86)\Steam\userdata\[SteamID]\1202900\remote\[SteamID].json
Progress in a JSON file named by Steam user ID. Copy with Steam closed. The filename ties the save to its account.
~/Library/Containers/com.ustwo.awc/Data/Library/Application Support/com.ustwo.awc/CloudSave/Default
Mac saves as .sav files in the app container CloudSave folder. Same per-user logic as the Windows JSON, different wrapper.
~/.steam/steam/steamapps/compatdata/1202900/pfx/
Proton prefix for the Windows build (AppID 1202900). The userdata JSON appears inside the prefix.
Frequently asked questions
How do I move my progress to a new PC?
Copy the numbered JSON file with the game closed and restore it the same way. The filename is your Steam ID, so it only loads on the matching account.
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