OPML is an incantation of XML. XML is the general term.
If I export my Feedly data as opml in Firefox, I end up with a file with opml extension. Create new database, then import the file into it, everything looks as it probably should.
I’m having an issue similar to those noted above. I’m trying to import an .opml file and using DT3 3.6.2. When I drag and drop or File->Import->Files and Folders, nothing happens. No file appears anywhere in my database.
What does the file actually contain?