- m3u: #EXTINF tag data is displayed in "Short Name" column and can be edited
- m3u: fixed saving #EXTINF lines containing tag data
- m3u: readded "File / Save as" menu item (but not for other types of lists)
- fixed text input in "Favorites" column (for lists that only have favorite markers and not individual numbers)
- converted source code to use SDK/MSBuild project files (for future migration to .NET 7 or 8)