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You say that you inherited the solution. Is it possible that the file was inserted on a windows system with a version of FileMaker that was version 11 or older?
There was a different insert option called "Insert Object" that used OLE (Object Linking and Embedding) to insert an "object" into the field. One of the frustrating limitations of this now deprecated option was that you could open the file in the object's application but you could not export the file contents via script or menu option. If this is the case, then there is no way to do what you are requesting.
Thanks, not sure about the legacy of the solution, but would the OLE possibility still allow me to drag from the container field to the desktop, and deliver a working file? That's what I can do at the moment, which seems odd.
I do not know as this is not something I tested back then and don't have a FileMaker 11 solution currently available where I might test this