LAMMPS is a GiD-problemtype that wraps the LAMMPS classical molecular dynamics (see lammps.sandia.gov)
This version includes LAMMPS compiled for Windows x32. The same version will work on Windows x64, must simply copy the contents of LAMMPS.gid\bin\win-x32 to LAMMPS.gid\bin\win-x64
For Linux platform must add the appropiated binaries to LAMMPS.gid\bin\linux-xx