Here is a list of all files with brief descriptions:

source
include
TGeoMCBranchArrayContainer.h
TGeoMCGeometry.h
TMCAutoLock.h
TMCManager.h
TMCManagerStack.h
TMCOptical.h
TMCParticleStatus.h
TMCParticleType.h
TMCProcess.h
TMCRNTupleParallelWriter.h	Definition of the TMCRNTupleParallelWriter class
TMCRNTupleWriter.h	Definition of the TMCRNTupleWriter class
TMCRootManager.h	Definition of the TMCRootManager class
TMCtls.h
TMCTTreeWriter.h	Definition of the TMCTTreeWriter class
TMCVerbose.h
TMCVersion.h	Definition of the code version and release date
TMCVNtupleWriter.h	Definition of the TMCVNtupleWriter class
TVirtualMC.h
TVirtualMCApplication.h
TVirtualMCGeometry.h
TVirtualMCSensitiveDetector.h
TVirtualMCStack.h
src
TGeoMCBranchArrayContainer.cxx
TGeoMCGeometry.cxx
TMCAutoLock.cxx
TMCManager.cxx
TMCManagerStack.cxx
TMCRNTupleParallelWriter.cxx	Implementation of the TMCRNTupleParallelWriter class
TMCRNTupleWriter.cxx	Implementation of the TMCRNTupleWriter class
TMCRootManager.cxx	Implementation of the TMCRootManager class
TMCTTreeWriter.cxx	Implementation of the TMCTTreeWriter class
TMCVerbose.cxx
TVirtualMC.cxx
TVirtualMCApplication.cxx
TVirtualMCGeometry.cxx
TVirtualMCSensitiveDetector.cxx
TVirtualMCStack.cxx