MS Access Import/Export Specifications
Microsoft Access stores Import and Export Specifications in two system tables:
These tables can be joined using the SpecID column. Here is a handy piece of SQL code you can execute from within Access itself to extract the specification of your choice.
If you happen to be handy with SQL you can make changes to a specification and adjust existing fields or add new fields by executing SQL statements against these same tables. This can be much easier than recreating a specification from scratch.