[@netweb Keymaster 12 years, 5 months ago]

I wonder if there is any way to convert/transfer the attachments so that they will work as well?

I haven’t seen any particular effective ways to do this yet, I have a few ideas on how to add support to import the attachments into the WordPress media library but it only exists in imagination at this stage, once I get the time to take a look I most certainly will have a crack at it.