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 Sounds like it's using areas available to store information on the 464, but not necessary acceptable on 664/6128. JL-COPY is perhaps one alternative I can think of which works on all systems.
20 / 20Great file copying program but only compatible with the 464 if i remember right (aka 664 & 6128 makes it do weird things). So mainly a 464 tape tool or if you could afford a DDI of cause. Probably should have a CDT file as i imagine it as mainly a tape tool.