Below is partial documentation for the
WFM file format for the Rigol DHO800/900 oscilloscopes. Its format greatly differs from prior Rigol scopes. Official documentation for this file does not appear to be available. This is from the v01.02.00.02 firmware.
Once I realized that the WFM file format does not support the Logic Analyzer, I stopped researching it. Hopefully this work will still be useful to some folks.
https://github.com/Lathe26/WFM_for_Rigol_DHO800_900