it downloads a file that you can then import into your RSS reader of choice
That’s not how it works — the feed isn’t a file that you download. You copy that feed URL and paste it into your RSS reader’s ‘subscribe’ feature. Then your reader application will regularly check that URL for new posts.
By the way, there’s an RSS community: !rss@lemmy.ml
All good! Since RSS doesn’t really have modern levels of polish and usability, I just wanted to make sure we were being precise for OP.