That will work unless the following condition does not exist:
There are no DocuWare 5 legacy internal index field numbers in the file cabinets. If there is, theses index fields will not be carried over to the new file cabinet when creating based on the exported cabinet XML.
Meaning the cabinet would have to have been created in 6.8 or later.
Please email me with the Support Request number. I am not aware of an upgrade that has been abandoned. There is always a solution.
Senior Director Support Americas