What model is the successor to the DX100P/DX200P? Also, can data files recorded on the DX100P/DX200P be opened using the software that comes with the successor model?

The successor to the DX100P/DX200P would be the DX1000/DX2000 with the advanced security function option (suffix code: AS1). Data files recorded on the DX100P/DX200P can be opened using DAQSTANDARD (DXA120), which comes with the DX1000/DX2000.