Files that you open are automatically added to the Playlist.
By default, files are displayed in the order of last opened, but you can change the default order by clicking the column headers. To display them in alphabetical order, click the File Name column header.
If you drag files from Windows Explorer onto the Playlist, files currently on the Playlist will be removed and the new files displayed in alphabetical order.
The FTW Transcriber only enables you to open one file at a time, but by using the Playlist, you can quickly switch from one file to another as if they were all open.