I'm retrofitting Delightful Downloads to my site that already has 80 .GPX files available for download. The files were all uploaded using 'WP-GPX Maps' reside in /wp-content/uploads/gpx/ directory and currently download fine via text links in the page content.
Using Delightful Downloads I am obviously wanting to manage downloads to registered users only. I have added all the files to DD and generated shortcodes for them all and placed download buttons on the page, however when the download button is clicked the files are served up as a .htm file, not .gpx.
I presume I am missing a file/mime type setting somewhere, but I have no idea where. When I installed WP-GPS maps I had to add .GPX as a MIME type to the IIS server, so I know it's setup there.
Sample page with existing text link: http://www.adventureridingnz.co.nz/gps-tracks-rides/north-island-tracks/north-range-road/
Sample page with DD button: http://www.adventureridingnz.co.nz/gps-tracks-rides/north-island-tracks/wharite-peak/
Can you offer any advice?