Import/export Product Variation Downloadable File Settings

Every time I import updated product files, I lose all my variation download file settings. I know that it happens because I check the box to delete existing files of downloadable products, but if I don't check the box, I get duplicate files added. I could just delete those products from my import file, but is kind of a pain.

Also, most all of my products have downloadable variations, and I would really like to be able to make all the changes in a csv file instead of having to open each product variation to change the settings individually. It doesn't look like those are settings I can export or import. Is there a way to add variables to the import/export list? I thought I saw something a while ago about it, but I can't find the information now.