"Seems like the reference (fmnet) used in FM7 as to where to export records to host isn't the same as in FM10."
Could you elaborate on that, perhaps with an example?
From your description, it sounds like some sort of script is being triggered when you close the file that attempts to export data to a specified location.
How are you hosting the shared database? Filemaker Pro 7?, Filemaker server 7? or ?