Yes but it overrides the current list
yes, you can go into a folder on your file browser on windows and select multiple files using CTRL key and right-click and choose the mp3tag option, however once it loads those if you wanted to add certain specific files from another folder, there isnt an option for it only to add directory and you cant drag&drop them in because it overrides the current list with the files you drop in.
its just because sometimes ill be editing a list of files and will remember something i really need to do in another file that's similar to something I'm currently working on in another place and don't want to interrupt my current work flow but want to quickly edit another file. Also it kind of ties into there only being an option to add directories and not individual files. But yeah, sometimes I just want to have multiple windows so i don't have to change my current project in any way.