I propose to extend Get_Export_Formats_Resp response with possibility to get the current document "native" type. E.g. we implemented a Download button with submenu for export format selection. However, we also alow the user to hit the button without selecting the format. Which means we'd like to pre-select the format according to opened document. So, now we have: [ {"Label":"PDF Document (.pdf)","Format":"pdf"}, {"Label":"ODF presentation (.odp)","Format":"odp"}, ... ] I propose: [ {"Label":"PDF Document (.pdf)","Format":"pdf"}, {"Label":"ODF presentation (.odp)","Format":"odp", Default: true}, ... ]