Merging MYOB backup files.

My boss is trying to merge a couple of MYOB v6 backup files (.dat) into one single file.
Problem is that he purged some of the info during the year and now he
wants to use his backup disks to reconstruct the entire year. Can it be done?
So he wants to merge backup files together... does MYOB v6 offer a merge feature that would drop duplicated entries?
Some detailed instructions or a website pointing to indepth info on MYOB would be greatly appreciated as MYOB is no longer supported in Canada.
The .dat files are backups of MYOB v6, he now uses MYOB v9 (PLS files). He knows how to upgrade .dat files to v9 of MYOB.
TIA
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