Files of type .txt are not in the list of file types that open in the previewer. They should be.

In older versions (5.3 in our case) links to attached text files and SQL files (ie, *.txt and *.sql) open the files in the user's default application. (for ex, Notepad or IDE)

In v5.9 (which we're trying to migrate to), the links produce the ugly "Can't Preview this File - You must Download to see this File" message.

That's lost functionality.

It would be nice to be able to list a set of file extensions that should preview as text - eg, json, html, xml, etc.