Cannot find AGS (3.1) import mapping file for export and edit

My company has an existing config pack setup and applied to a particular project. When importing AGS Data (Data>Import Data) 'AGS 3.1' is provided as a file format I can specify with an existing mapping available (a particular version of AGS3.1 used by the roads authority in NSW, Australia, in case it is relevant).

I want to export this as XML to make changes (Configuration>Transfer Mapping>Download Import XML Mapping) but AGS 3.1 is not available as a file format I can select from the drop down. Screenshots below