C:\Program Files (x86)\Steam\steamapps\common\Cities_Skylines\license_key.txt or within your user profile’s Documents or AppData tree, depending on the distribution channel. A typical license_key.txt looks something like this (the actual characters are omitted for privacy):
The file is typically located in a folder such as: cities skylines license key.txt
| Function | Explanation | |----------|--------------| | | Contains the alphanumeric string that proves you own a legitimate copy of the game. | | Activation | Some third‑party tools or mod managers may ask you to paste the key to unlock additional content (e.g., the Paradox Launcher). | | Backup | If you need to reinstall the game on a fresh system, the key can be re‑entered manually in the launcher. | | Troubleshooting | Support agents sometimes request the key to verify your entitlement. | | | Backup | If you need to