Slack has a relatively new feature called "Posts". These are inline attachments that have extended HTML formatting. While Slack client shows them formatted, Ripcord only offers to download an attachment of application/vnd.slack-docs content type.

This one is a big problem. It relies on heavy amounts of JavaScript and web browser features. A web browser is not something I can implement myself.

However, it's possible to do something better than the current 'download' behavior. Ripcord should probably at least attempt to help the user open the relevant file in the web browser or something.

Well, then put it in your backlog, please.