Steve,
I don't know the answer to that, I don't think I've ever tried it in fact. I'd assume that doing a MODI DATA on the VFP6 DBC would convert it to VFP8. Once that's been done VFP6 can no longer use it.
I don't have time right now to test this premise I might be able to try it this weekend.
>There isn't a mechanism (not 3rd party) to move the DBC forward? Besides gendbc.prg, run the script in VFP8 to make new DBC and tables, and append the data from the old tables?