Pathfinder currently only works for single beam data. A customer is looking to convert multibeam data to single beam data. A feasible workflow would have been to use pathfinder to make a line file, then run TIN Model Export to ALL Format using the generated line file. But, I can't generate a line file from the multibeam data using Pathfinder.
You can load multibeam data in the old Single Beam Editor and export that to EDT files which can be loaded in Pathfinder. You can also just bring in the raw files that are collected during MB acquisition and do the same.
Ideally, Pathfinder should be built into the editors.