CS1 Datasync

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This mod lets you automatically synchronize Mods and Assets between players when playing Cities: Skylines (CS1).
That way, everyone has the same setup without manually copying files.

Requirements

• Hamachi (or another VPN tool) to connect players’ PCs.
• Harmony Mod (mandatory, as many mods rely on it).
• All players need the CS1 File Sync Mod installed.

How it works

• One player starts as the Sender → shares their installed Mods & Assets.
• Other players connect as Receivers → automatically download missing files.
• File transfer happens via HTTP directly from PC to PC.

The mod works with the standard CS1 directories:

• Mods: %LOCALAPPDATA%\Colossal Order\Cities_Skylines\Addons\Mods
• Assets: %LOCALAPPDATA%\Colossal Order\Cities_Skylines\Addons\Assets
• Steam Workshop content: is detected and synchronized too.

This means:

• You can sync Workshop mods/assets from a Steam user to someone without Workshop access.
• Perfect for multiplayer sessions where everyone needs the exact same setup.

Setup

1. Start Hamachi and join the same virtual network.
2. In game:
   • Sender: click Start Sender.
   • Receiver: enter the Sender’s Hamachi IP and the port (default: 5005).
3. Once you see Connected → click Synchronize.
4. The mod downloads and updates Mods & Assets automatically.

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Development

To build the mod yourself, you need:

• .NET Framework 3.5 SDK
• MSBuild (version 17.14.23+b0019275e or newer)

Build command (run in the repo root):

msbuild .\CS1.FileSync.csproj /p:Configuration=Release /t:Build

This will produce the compiled DLLs in the bin\Release folder.

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Contributing

Contributions are welcome!

• Translations: add a new language file under
  resources/lang/<your-language>.json.
• Bug fixes / features: open a pull request on GitHub.
• Issues / feedback: use the GitHub Issues section.

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👉 In short: Workshop → normal CS1 folders → shared with your friends.
Great if not everyone uses the Steam Workshop, but you still want a synced set of Mods & Assets for multiplayer.

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Buy Me A Coffee

If this project has helped you in any way, do buy me a coffee so I can continue to build more of such projects in the future and share them with the community!