MRS Tools

A Windows desktop tool for decompiling and compiling .mrs files used by GunZ: The Duel private servers. Built with C# / .NET Framework 4.0 (WinForms).

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Features

• Decompile .mrs files into their original formats (XML, DDS, WAV, etc.)
• Compile folders back into .mrs archives
• Decompile all .mrs files in batch with a single click
• Supports encryption methods used by legacy private servers (Lambda, Steven)

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Requirements

• Windows (x86 / x64)
• .NET Framework 4.0 or later

The tool extracts mrsencryption.exe, encryptcustom.dll, and zlib.dll into its working directory on first launch, and removes them on exit.

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Usage

1. Place MRSTools.exe in the same directory as your .mrs files (or navigate to them from within the tool).
2. Launch the application.
3. Right-click any .mrs file to Decompile, or right-click any folder to Compile it back.
4. Use Decompile All from the menu to process every .mrs file in the directory at once.
5. The log panel at the bottom shows real-time output from the encryption engine.

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Building from Source

1. Clone the repo:

   git clone https://github.com/your-user/MRS-Tools.git
   

2. Open MRSTools/MRSTools.csproj in Visual Studio (2019 or later recommended).
3. Build → Release | x86.

The output binary will be at MRSTools/bin/Release/MRSTools.exe.

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Known Limitations

• Windows only — the encryption engine (mrsencryption.exe) is a native Win32 binary.
• macOS/Linux support is not available yet (planned via CLI port + Wine wrapper).

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Credits

• Original tool by s00rk — GunZ modder and developer.
• Fixes and improvements by contributors on GitHub.

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License

This project is provided as-is for educational and modding purposes within the GunZ community.