This is Mono. Installation: Read doc/download for installation instructions, or read the HTML version: http://www.go-mono.com/download.html A directory roadmap: doc/ Contains documentation and the web site contents. mono/ The core of the executable. metadata/ The library to deal with executables and libraries for .NET dis/ CIL executable Disassembler cli/ Common code for the JIT and the interpreter. cil/ Common Intermediate Representation, XML definition of the CIL bytecodes. interp/ Interpreter for CLI executables. * Using Mono Once you have installed the software, you can run a few programs: monodis program.exe That will dump the bytecodes for program.exe. Monodis support a number of options that dumps various metadata tables (chapter 23 of the Partition III). You can try the interpreter like this: mint program.exe