Are you trying to have Foobar show the txt file in one of the panes, like you can with cover art or playlists, etc.? Foobar has so many cool ways to customize the layout, but I've never seen the option to display the txt file, despite its ability to reference the file for Live Show Tagger. Maybe there's an add-on out there, or a way to build a theme. Maybe reach out to them directly?