CS2J can be built on Windows (requires .Net framework 4 to be installed) or on any system that supports Mono (http://www.mono-project.com/Main_Page). The solution file in src/ should load in Visual Studio 2010 or MonoDevelop, or you can build from the command line by running 'mkit.bat' (Windows) or mkit (mono). This will build a cs2j.exe executable in src\CS2JTranslator\bin\Debug\cs2j.exe. Documentation for cs2j.exe is in docs\external\CS2JUsersGuide.pdf. Contact kevin.glynn@twigletsoftware.com for further help.