- MEDFileUtilities::AutoFid fid(MEDmemFileOpen(MEDCoupling::MEDFileWritableStandAlone::DFT_FILENAME_IN_MEM,&memfile,MED_FALSE,MED_ACC_RDONLY));
+ std::string dftFileName(MEDCoupling::MEDFileWritableStandAlone::GenerateUniqueDftFileNameInMem());
+ MEDFileUtilities::AutoFid fid(MEDmemFileOpen(dftFileName.c_str(),&memfile,MED_FALSE,MED_ACC_RDWR));