ascii to binary conversion in sco 5.0.5

Here is what I did . . . . I FTP'd several *.dbf zipped files from a SCO 5.0.5 server to winXP machine, and did not set the transfer mode to BIN, now when i was uncompressing these files in SCO 5.0.5 , it was giving "Bad Decode Table error. Is there a way to convert the *.dbf.Z files to Binary so that i can open it again.Thanks in advance

No, the technical term is "you have screwed the files up".