For the DPO4000/MSO4000 series scopes+ what is the native waveform file format file type?

For the DPO4000/MSO4000 series scopes+ what is the native waveform file format file type?

The native format is a .ISF format file, which is a binary format file that is essentially the same format as is available from the instrument when you use a WAVF? Command via a control bus.  It consists of an ASCII setup command section and a binary CURVE string.