There is another way to transfer ATF files from APL2 to Dyalog V13.0:
use )OUT in APL2 and use ]IN in Dyalog (this is a user cmd) instead
of )LOADing the 'atfin' ws. It's a bit simpler.
This will transfer vars & fns but you will need to tweak the fns with
illegal lheaders in Dyalog.
There is yet another way to transfer and avoid this manual translation
problem but this should get you going.