Hello all! Recently, I tried to compiled the x-ray fluro sample under MS compiler and catch a lot of simple bugs!!!!! 1. XrayFluoDataSet.hh( line 84) : 'XrayFluoDataSet::LoadData': overriding virtual function return type differs and is not covariant from 'G4VEMDataSet::LoadData' 2. XrayFluoNormalization.cc( Line 57) : 'XrayFluoDataSet' : cannot instantiate abstract class due to following members: 'void G4VEMDataSet::SetEnergiesData(G4DataVector *,G4DataVector *,G4int)' : is abstract G4VEMDataSet.hh(68) : see declaration of 'G4VEMDataSet::SetEnergiesData' 'G4bool G4VEMDataSet::SaveData(const G4String &) const' : is abstract D:\GEANT4_9_0\include\G4VEMDataSet.hh(71) : see declaration of 'G4VEMDataSet::SaveData' I am sorry, but How you can test such code???? Sincerely Yours, Viacheslav Porosev